I'm sorry that she did this to you.
If you block her then she won't be able to contact you. Perhaps that would help you move on.
Also, you could treat this like a death to you and grieve the loss as you would other losses. You could write about her, talk about her as you might at a wake, perhaps create a small ceremony for yourself, all focused your connection with her and on the fact that now she is gone.
I'm really sorry for your loss.