Anne sounds positive. For the 1:1, state schools could apply for top up high needs funding whilst applying for an EHCP, I don't think it's available for MS indies but it would be worth asking someone like IPSEA or SOSSEN. Make sure the ASD buddy is carefully chosen so they don't clash or compound DD's needs. I wish DS1 could engage with EMDR. Has DD seen an OT? It would help her sensory needs. Zoo there are numerous sensory toys to help DC regulate.
Zoo where possible we divide and conquer. I'm lucky DS1&3's needs don't clash, downside means one thing can trigger them both. It's DS2 (NT) that clashes, he is an extrovert, doesn't understand their difficulties and can be less than sympathetic, although doesn't get away with being nasty. DD2 takes herself off when things are too much.
Runner over time you will learn when to push and when you must stop otherwise you will reach crisis. Backlash is common because you are pushing DD out of her comfort zone. Don't take it to heart, it isn't personal. DD takes it out on you because she knows your love is unconditional.
I would insist on observing medication until she proved reliable. Cajoling DD out of her room with favourite food that must be eaten downstairs and playing favourite games sounds like it would be a good start.
There's parental leave if you need some time off work.
Now An NHS ASD assessment needs a GP referral. If DD wants to go down that route I suggest writing a list of points and completing the AQ then pushing the GP. Some private assessors will want a GP referral too.
Universities often try to help those on a leave of absence - which is often viewed differently to leaving completely. If DD doesn't receive DSA support she should apply in preparation for returning next year.
It's appointee for UC. Guarantor is sometimes required for renting. As we are still in term 1, for which she received student finance, she may not be able to claim UC yet or the amount may be reduced.
She may be 19, but is still part of the household. Everyone needs to maintain their hygiene, health and home including adult children.