Well now, this is a tough one. Honestly, I believe that sometimes the best possible relationship one can have with someone this toxic is the one that happens from a distance. Yes, she's your mother, yes, you want to see some remorse from her, some change, but sadly, I think that for some people this requires a level of personal evolution that just will not happen. Your primary duty is to yourself, to protect yourself from the emotional destruction she may wreak in your life. If you do decide to see her as it may be the last time, do it entirely on your terms. She doesn't need to know exactly where you live or any other details of your life - I suspect controlling the interaction in that way is the only way to limit the emotional havoc she can wreak for you. It sucks, I get it, but she is who she is. Make sure you don't give her any more power in your life than you are comfortable with her having.