First, I want to thank everyone who replied to my OP. I think that I'm going to just go with my heart and just tell her that I don't want be her friend. I just can't trust her enough to have her as a friend not just because of what happened with my ex but because I feel like she has an ulterior motive that I haven't figured out yet. I also feel I need more time to let go of my negative feelings toward her even though she has apologized to me. I'm just going to continue to be civil toward her so we can continue to co-parenting my daughter with my ex. I'm going to tell her in the nicest way possible and hopefully she will take it well.