What Kai doesn't realize is she'd look like a better mom (to me at least) if she openly acknowledged Gracie's delays and showed attentiveness and attempts to remedy or treat them rather than hide and deny that her daughter is less than perfect. She looks neglectful when she claims "everything is fine" when it's pretty obvious Gracie is delayed.
Part of me wonders if Kai even realizes how delayed Gracie is. I mean, I'm pretty sure she reads YTT on a somewhat regular basis, and they can't stop talking about how delayed that poor kid is. But does she really understand? Or does she just think they're being assholes?
You see that's my thoughts on this as well I am not sure Kai is even realyl aware Gracie even has problems, she seems to have a hard and fast understanding i.e. Baby, small kid, teen, Grown up and no idea about the transitory phases that are really really important.
But we also know that other than Photo op's she doesnt really spend much time with her, unless they just happen to be in the same room together, so there is a good chance she hasn't spent engought time around her to really pick up on it, so that's a concern as well.
MW currently supervises most of Kai's interactions with Gracie from what we can tell, and probably helps with basic tasks like feeding and hygiene.
As much as I despise the term it is quite apt, she is very much the "Sister mom" Kai does non of the day to day leg work with gracie and I think MW has ensured it's that way because she is frightened of what Kai would be like with her left alone for a prolonged period of time.
I have mentioned it before but Kai has flashes of anger if not downright Rage with a worrying frequency when Gracie does something normal that Kai doesn't expect or understand. Now imagine if MW went out for the evening and left Kai in charge an Gracie played up as kids do - I can see Kai lashing out at her because she can't handle the situation after a few hours of playing mommy.
Unsupervised, I could see Kai unintentionally harming and/or neglecting Gracie and subsequently getting CPS involved. It's not uncommon for disabled parents to get their kids taken away due to negligence (I've read about a woman with an IQ of 70 who had her daughter temporarily taken away because she didn't properly feed the baby [she missed scheduled feedings because she can't read analog clocks] and struggled to preform other basic needs like diaper changing.)
See what I said above but I can honestly also see Kai not intending to hurt the child but doing it either in a fit of rage or just being rough with her, when I was about 3 I was on my first trike riding next to my dad and nearly rode into the road when a car was coming my dad just grabbed my arm an pulled me back really really hard and I was frightened an confused but he did it because there was a car speeding down the road and he was doing it to protect me, I'm not talking of Kai doing something like that out of having to react quickly and using more force than necessary.
No what I am talking about is her just picking her up an handling her like a toy (
imo Kai see's her as nothing more than a toy / prop out of ignorance) and ending up really hurting the kid

not out of malice but just by ignorance and when your a fully grown adult that's absurdly easy to do, hell Kai is the kind of person who doesn't really understand basic child safety, so she doesnt really need to be involved for Graciey to come to harm she could just leave a pair of hot curling tongs in easy reach and Gracie is going to get hurt. I'm glad she doesent cook / or picked up the yummy mummy in the bed an kitchen thing so Gracie isn't likely to be put in a position where she can pull a pan of hot oil over herself, or get fed poorly cooked chicken an alike.
Keep in mind though, kai rarely leaves the house anymore.
I don't think she ever really has, I think David remarked on how much more active she was when they where dating than ever before - Kai through a mix of happenstance and isolation engineered by her mother has wound up the human equivalent of a house cat, you can take her a very short distance and she is very much out of her framework of reference and she can't deal with it.
My guess is Kai like Phil wasn't that much of a curious child, but any curiosity they did have was stunted by being dropped infront of a TV for hours on end and no stimulation to encourage curiosity, hell I mean just look at MW's prohibition of crayons onside the house that's not a new thing and Kai was brought up with the same rules, that's part of the reason she is so stunted she was never intended to be her own person an was denied the basic tools of self expression we all try and master at a young age like art (the creation of art is a basic trate that defines a modern human alongside tool use).
I live with a 14 month old child and he's at least getting to grips with crayons an such and trying to draw things he see's (
really rough outlines of people, more basic than a stick figure) and that's perfectly normal to start doing at that age, but Gracie doesn't seem to have done anything like that and self expression is a defining part of the human condition, and it's something you need to develop in your very formative years. Kai didn't an Gracie is being denied that opportunity as well.
Hell for Kid's drawing is a way of working things out that have happened to you, or your place in a situation. I mean as a adult you'd be hard pressed to find a adult who doesn't find sketching there feelings as cathartic (if you don't do it seriously give it a try). Without more access to Matt's family I can honestly say Gracie is going to end up worse than Kai but had the possibility of being so much more.