By no means am I moving out other illnesses for the record. I think shes a cluster B nightmare entirely and an absolute fucking wet dream of a case study.
I'd vote schizoaffective over schizo because schizoaffective is the bastard child of bipolar and schizophrenia. She has the moody highs and lows as well as her domineering complexes where she is highly agressive and melt downs. If she can keep a job it shows she can keep her shit together for long enough. It's difficult to tell about her hallucinations but I would agree she has a lot of delusional thought she believes. It's not usually as delusional as I would see in full schizos. She has enough grasp on reality to tie her theories into something probable or generally somewhat believable (abuse and rape). If she was out here telling us she was talking to god and an arch angel I'd buy full schizo. Being a bit on the side of woo medicine or witchcraft and having some weird beliefs isn't enough.
I agree on the neurodevelopmentally disabled (great catch btw) part because at first I read her as autistic due to how she wrote and taking some of her claims at base value. "Wouldn't she have plastered autistic everywhere?" Well yes but what if she was never diagnosed formally because we KNOW she isn't medicated or in therapy. So I'm willing to believe neurodevelopmentally disabled or undiagnosed tism spectrum (or both). Once again kind of goes back into my childhood abuse theory (brain injuries from abuse in kids can do this). But this is not my specialty field (neuropsychology) so I cannot give effective full (albeit speculated) judgement. But I have seen cases in adult (troons actually) where they had severe cognitive developmental delay from childhood sexual and physical abuse that ended up forming cluster B nightmare. In these cases as well they were able to hold jobs but when under distress or discomfort absolutely mcfucking lost it due to brain structures not being fully formed or legitimate childhood ptsd/cptsd.
The thing is neurologically, if this theory is true, this means she literally cannot control her behavior. There are no pockets for the spaghetti to even fall out of. It's just naturally everywhere. She is basically unable to fully self manage her outbursts even if she wants to.
For shiggles here's what fixing her would look like:
Treatment plan if she were an actual patient at a top care facility: a full neurologically and biological workup, medical history of parents/relatives (bipolar and schizophrenia are genetic disorders ), formal diagnoses, treatment plan discussed with patient to give her sense of self efficacy, meds, brain exercises on them cool electrodes with medication to rebalance and regrow retarded structures as well as stabilize mood, intensive behavioral therapy in group and individual setting with specialists for cptsd/trauma victims and cluster B meme dreams. I would also vote for creative therapy models since shes such an extreme case so using art/animals/music etc. Weekly or biweekly therapy follow up with likely a PhD level specialist and regular psychiatrist visits. The goals would be to get her brain working right then empowering her with coping mechanisms and thinking processes to deal.
Just to shit up the threat even further with our psych sperging:
Having seen a bit more of her, especially her behaviour during the "transitional" phase of quitting her job, I'm more (though not totally) inclined to agree with you about BPD + some kind of psychosis -
maybe schizoaffective, though I'd maybe want more evidence of a prolonged, pronounced manic and/or depressive state before committing to that (as opposed to her current, continuous and low grade "I'm really sad but full of love but also I talk to ghosts and everyone abuses me" thing atm, which is more emotional instability/paranoia/delusions imho). I'd be reluctant to diagnose autism on top of those two without really classic signs (which I don't think she has) or strong childhood evidence (which we don't have access to), given the symptom overlap with BDP already (munchie fave is to nudge their BPD diagnosis into an autism one for pity points and internet clout). Would be especially reluctant if we think she's maybe telling the truth about the CSA stuff, which could introduce PTSD into the equation (again, big symptom overlap with autism). Might be tempted by dyspraxia (depending on how weird her movement looks over longer periods/more motor-control demanding tasks; would explain the weird movement and fucked handwriting though), or mild intellectual disability, or one of those other million minor "like autism but not lol, brain's a bit fucked I guess" NDDs that DSM-V has.
(The "not plastered autism everywhere" thing is also interesting in the context of her being some kind of cluster B nonsense; you think if she hit anything like any of the autism diagnostic criteria, she'd self-diagnose and cling onto it as another thing that makes her Special And Interesting UWU. And in the context of her being able to keep her job - if she
was autistic, on top of BPD and schizoaffective, I'd be surprised if she could mask well enough to hide everything going on from her employees. In my experience, if "all" someone's dealing with is autism and they're relatively high-functioning, they can mask the autism to an extent, but the minute you start piling shit on top of that... a) it overwhelms the person's limited self-management capacity, even if they're otherwise high-functioning, and b) the social/people/manipulation and self-regulation skills you need to hide shit like schizoaffective are way beyond the capacity of the overwhelming majority of autists.)
If this is how she talks and acts around the parents, I can understand how she got hired and how she is still employed. She can turn the crazy off and on to a certain extent. What do the psych-kiwis think of that?
I think her handwriting alone is evidence that there's something other than cluster B going on here; more evidence in favour of dyspraxia, schizophrenia, or some other intellectual disability/neurodevelopmental something that affects motor control.
Turning the crazy on and off... as I said a few pages back, it depends whether she's masking (exerting a lot of effort to suppress their weird around other people; feasible, given it sounds like the parents see very little of her other than brief handovers) irl, or whether she's performing (turning the weird
up, deliberately; also feasible, given some other kiwi said she's only been on the full crazy train since the start of lockdown) for the internet. Former is an autism/schizo/something else neurodevelopmental; latter is a cluster B nightmare thing.
Admittedly she might be doing a bit of both, which could either mean neurodevelopmental plus cluster B, or neurodevelopmental and has learned that being a drama queen gets her more love and affection that she doesn't know how to acquire otherwise.