Should I not invite my mother for my wedding day?

My mother betrayed me so many times in my life, I lost count. She hasn't been a decent mother to me or to my other siblings and has even lost custody of them when they were little.I have been through hell and back with her but have always let her back in to my life and gave her many chances when no one else did. This year it was different. She did something I can not see a way to forgive and forget. Two days before me and my husband got married in the courthouse, she lied to me she had cancer... A few weeks later, my husband and I finally were expecting a long awaited baby, she didn't even call to congratulate. She was beside my grandfather when I called them to tell them the news. He was ecstatic, but said that she didn't say anything and never even asks about me... NOW, I am having a big church ceremony in 3 months with the love of my life. I don't see the point of her being there. I don't even have a wish. She likes to drink and make a fool of herself. I don't want to worry about her on the biggest day of my life and maybe the happiest... On the other hand, I don't have a father either and am having anxiety about not having either parents on my wedding day. My closest family is my granddad and aunt who have been EVERYTHING to me my whole life. What would you do? Also She is not the type of level headed person you can sit down and talk with, she is schizophrenic and loves confrontations. I just want to find peace in my life and think of me and my future family first for a change.