I was going to say, your mom should be showing remorse for what she allowed to happen during yiyr childhood. That would be my FIRST requirement for allowing her back in my life beyond surface level "hi how are you" communications.

Honestly after what I put my daughter through with my major depression & suicide attempts in her senior year of high school, apologizing to her & letting her know I was healing after leaving her father was key to increasing our communication. We live half way across the country from each other so daily interface other than over the phone can't happen. But she now understands what I was going through. We now have fairly good communication though finances keep us both from being able to get together IRL.

If your mother hasnt come to you with regret about what she did then I would truly keep her at a distance. Remorse should be offered not asked for. Though I would keep some level of communication open as you NEVER know when her heart may be moved to say something