Idon'twantthat Have some unmumsnetty hugs back!
You do need to try and breathe, and space out what's happening. Eat well and look after yourself. This stuff sucks the breathe and stability we've built up over years from us in minutes.
I doubt I'm over projecting in saying this has partly thrown you mentally back to a time and place of lack of rights and power.
You aren't that person any more, and No IS a complete sentence.
There is a power game going on here. They've behaved as they have and now want you to get on board with it, understand them, accept their judgement, and talk to them and most of all accept them as knowing best, because they're the 'good responsible' people, doing 'the right thing' and they believe themselves to be the experts.
Maybe in their heads and world they are, but never under estimate the number of professionals and do-gooders who absolutely feed off the drama they create, and their sense of having a right to be powerfully in the center of it all.
Yes trauma doesn't just go away, but they have some nerve trying to tell you it will negatively affect your relationship with your daughter in the future if you don't stay with them and do things their way, and that you will automatically turn into some sort of armchair psychology trope! It's the professionals version of 'if you leave me no one else will ever love you!'
Everything has some affects on the relationships with our children, but IME as your children hit the ages you were when xy and z happened, you use your common sense, because you're not an idiot, and you know that stopping your child from developing does the opposite of protecting them, and because you've already brought them up with the stability, self worth, and confidence that they matter deeply and have adult back up, that you never had.
The worse that's likely to happen is you'll raise them well, and then have even more years you've burried stuff to unpick, when they're free flying. 