You are making excuses to be scared! It doesn't matter what or who she is or who she thinks she is, she has no power over you. You are letting her have power over you with these excuses. I'm not saying they aren't true but they ARE excuses that continue to stomp you down and prevent you from doing what you need to.
If you want to stop living in fear, if you want to get over this, you have GOT to either move on or stand up.
Hate to be brutal, but honestly I care about you, and I'm just trying to help you.
You CAN RUIN her if you wanted, do you understand me? You could turn those friends of hers against her more easily than you think. Be trustworthy and believeable and get to the heart of the matter you can make them believe you.
Or you could move on. You are an adult woman now. You can forget all about her and fill that hole in your heart with something better. Just ignore the messages. There is no law that mothers need to see their children. She can't press that in court or anything else! You know who can press charges or file in this case? YOU can if you want to!
Either forget her or do something about her, but doing nothing and letting it get to you only feeds the monster that is her.