Sooverthemill
(((hugs))), I hear how difficult everything is for your daughter, for you and your husband.
If the right support was in place, having her own flat would be good for future proofing and it would be good to know she was settled semi independently of you and her dad. But if this is a step too far for you atm, wait until the right time.
But look after yourself, you need to have time off. It is essential. It is worth trying again to find an carer for your daughter. Social services should be funding a certain number of hours of care weekly.
My friend gets her care money, in a dedicated bank account and pays her 2 part time carers out of that.
Interviewing is a pain but worth doing to get the right people. Likewise keep looking the right people will eventually turn up.
On another point it would be very useful for hospital admissions, for carers and your husband, to have all your daughters health needs written down. In a folder/file which can go with her and saves your daughter having to use up spoons repeating things. Just a thought, you might already have this already eith carer assessments etc.
I hope you can put things in place, so that you can enjoy parts of your life and enjoy time with your husband and daughter without being the carer all the time.