I suspect that if she's telling you it was the best fuck of her life she's frustrated and wants more.
What you need to get out of her is was it the fact it was hate fucking that did it for her or just that it was really good sex. I suspect the former so if you do fuck her again it's going to have to be in a similar manner.
With regards to you being conflicted. Ask yourself if she asked you to fuck her would you hesitate? I doubt that you would.
