You don’t have to forgive.

What you need to do is focus on your own mental health.

I would probably send a text saying something like , since I am not the friend you would like and need me to be I think we need to stop communicating. I wish you well.

The end.. and don’t respond to her reply which I imagine one will come. Block and delete all contact with her for your own well being.

Since she lives far away you won’t have to worry about running into her.

Put yourself first.