It's good to hear back from you OP.
Did you say sorry to your dd1? That would be a good place to start, not to explain why as that can come across as putting your stuff on her and she just needs an apology all for her iyswim?
You can then say you are taking steps to change things for the better for her, the rest is your own to manage.
As to how you manage that, is very hard to know from a thread here, and not knowing what you've tried already and no need to list all that.
Have you seen the stately homers on here? It will make useful reading to see how, like yourself, other survivors have suffered.
Also, the charity for adults abused as children?
I can't think of the name, maybe napac? Try a search as I think one can do years of counselling pointlessly, and one year be transformational with another.
There is dialectic BT as opposed to CBT.
Certainly charities in the know will be able to give recommendations, as this is their area.
The main thing is to keep talking, processing and facing the issues until they are done.
You have probably asked why, but really look at what you think your DD represents to you, and what you think of you. In your minds eye, how you see yourself veiwed as you were as a child what feelings come up and whether your DD is triggering those things?
Just to point out (due to nasty pp) this is not that your DD intends or is aware of this, its your reaction, nothing she's actively trying to do. Just what is it, like, do you resent her wants, or needs?
Good luck with your decisions, brave to post and hope you find a way through this, you all deserve to be happy