To get in on the armchair psychology, I'd say Pippa's claim that living in a "low-income neighbourhood" is what turned her into a shut-in, where she was fairly outdoorsy if not sociable before, was telling. In addition to the rough childhood the autism could intensify the traumatic over-correction into neetdom and be where most of her anti-social traits develop from rather than any other mental illnesses.
Schizophrenia is a big claim and thankfully one she doesn't seem to actually show serious signs of so far, but it running in the family means she really should keep an eye on any developments.
Fuckers really can't help themselves. How hard is it not to throw sekrit knowledge right in the streamers face where you have to know it's socially unacceptable?