Honestly, I think her FTM trans stuff is mostly harmless. If it gives her a sense of security or a sense of self or self-esteem that's great. Yes, she is freaking out over being misgendered using a somewhat androgynous name over a speaker in a drive-through, and she thinks she's intersex/has an internal dick. But she was freaking out over the dick long before her trans phase and would be freaking out over something regardless of her gender identity.
She's not on hormones, and she's not seeking gender affirming surgeries. It could be so much fucking worse than it is right now.
She isn't seeking out support from trans groups online, which is probably for the best because even though she'd get all the validation she could ask for it would also expose her to the genderspecial set, and that shit is toxic as fuck. That being said, if she was seeking support in chill LGBTQ spaces that are aimed at people her age or older and aren't specifically trans spaces, she could probably find a fairly healthy support group. Of course she won't do that, because she's learned to avoid any online communities and even if they were completely sympathetic and kind they would somehow offend her.
I stand by my opinion that the whole thing is a subconscious 'fuck you' to Debbie, for all the years she forced her to bleach her hair blonde and take tanning pills, mixed with her delusional belief she's somehow a futa and a healthy dose of mental illness.