I think some responses here are harsh. The OP is clearly desperate. The theory family life causes or triggers OCD is just that, a theory. There are many other theories - PANDAS, genetics, chemical imbalances being some of the others.
Rubbing, of course "it isn't bloody normal", but you wouldn't say that to a parent whose child was physically ill so why say it to one whose child is mentally unwell?
Your DD won't be sectioned by what you have written here, unless things are much worse than what you have posted. Unless absolutely essential to keep everyone safe admissions can cause more harm than good.
But, you need to pester CAMHS. Every time you reach crisis point you need to contact the crisis team or take her to A&E, by ambulance if necessary. Every week contact CAMHS and update them on how you are not coping, and ask where you are on the waiting list and can you be seen sooner as your DD's MH is deteriorating.
I would second medication if not already taking any.
You could request a carer's assessment. Also, challenge not being classed as a child in need because your DD fits the legal definition.