Your relationship with your DD reminds me a lot of my DSis’s relationship with my DM. She can get so angry with her even now; thankfully she lives about 300 miles away, so they don’t see much of each other. I’m more of a people pleaser and usually hide my annoyance.
DM tries to micromanage everyone and everything and everyone finds it annoying. She’s 81 and unlikely to change now. I was reminded of that when you talked about having asked about your DD’s essay. Do you do that a lot? She may well find that intrusive at 21.
But, also like you and your DD, it’s a lot more complicated. My DSis and I were sexually abused by our F and our DM didn’t know about it. So there is resentment involved, which I suspect is the case with your DD. She’s probably directing her anger against you because her narc F isn’t around. That’s similar to us as well, though that’s because our F died 23 years ago.
None of this excuses your DD’s treatment of you. But she really does clearly need professional help to process her anger. She also needs to take ownership of her behaviour, as it’s unacceptable. She wants to be treated like an adult, so she needs to act like one and apologise. I wonder whether there’s a mental health issue, after everything that you’ve been through? The lying and accusations of gaslighting are disturbing, especially with you saying that she doesn’t appear to think she’s lying.
It would also be better if she moved out. It doesn’t need to be seen as a punishment even, but just giving you both space.