Wow, I work in this field and can’t believe some of the answers.
I have seen children younger than your daughter who are bigger than their parents and they have their parents pinned down or up against a wall.
The authority I work I. Have what we call a transitions team, the schools would refer children with high needs to that team who would then work with the family until adulthood., but if op’s daughter does not have a formal diagnosis at the moment this may not have happened. The family will work with both adult and children’s social workers to find the best outcome for the family, whether that involves children’s respite, which is easier than adults (as adults respite is like gold dust, or a PA to give family a break when the child is not at school.
Other ideas are discussed for when they leave school, such as day services, PA’s, shared lives, supported accommodation, shared care ( this is where a adult spends their time between the family home and somewhere else). For us residential is the last drastic option.
For behavioural issues we even tap into the local nhs who have a dedicated team just there for people with behavioural issues who work with both the families and the person themselves, to see if there are any strategies out there to help all.
If you have a good professional team around you, they will work with you, maybe ask if your area has a dedicated high needs childcare team that your case be transferred to them as they will have more of a good understanding of how your daughters mind works and that it is not your fault.