That’s great that you were firm and told her the being in contact with OM is unacceptable. I say that tongue and cheek because it is acceptable to you. What are the consequences for her continuing. If there are none then it’s a weak statement on your part.
Maybe giving her auto loan papers so she is forced to take on her own finances is something that I can do??? Again, she is paying me but making her put it in her name probably shows her I am taking steps to move forward without her.