This was well written so I'm going to approve it as a self post.

To me, it sounds like there is really no fix other than you guys moving out as soon as you possibly can. It sounds to me like she is so far gone that nothing you can say will make a lasting difference and it will just lead to conflict. Hopefully her therapist will make some ground with her, but I don't think there's any effective thing you can do other than to find ways to sanitize your living space more easily - which again may not be possible. It sounds utterly horrible to live with, and although she may not be doing it on purpose and may be a good person in general, the effects on you are intolerable.

Is there any way you can get out of the house? Any way you can find alternative accomodation while you save money to strike out on your own?

Hell maybe just find a new place to share with other room mates at the same price, if you can.

But with someone is this bad a shape, serious mental health intervention is required, and possibly a battery of carers. Neither of which you are capable of providing her, so you need to plan your escape and survive until then.