I have had enough of my mother and I'm thinking of giving her a choice, come clean or stay away!!!?

I don't think it's necessary to go into every detail as it would take forever...but the short version is my mother is one of the most evil people on this planet (im not a teen venting) she's tortured and killed children, animals ect This isn't a joke but Id need a novel to write it all. Here's the thing I emancipated young, I reciently mistakenly forgave her ( I was emotional just lost my family ect) here's the deal she hasn't changed and I don't expect she will but I would like some answers....Im fairly sure I won't get them but I feel I should confron her about these things....It's a miracle Im sane through it all and I think I'm entitled to a real explanation.....Do you think I wasting my breath? or is a good last try worth it so I know, also should I do this in a letter or over the phone? I can't do it in person ( you couldn't imagine the hate I have for her and I don't want to **** up my life anymore over it, if I had her infront of me bring up these things I know I would not be able to keep my calm)