Greetings 119: Welcome to the boards!
Sounds like there are two issues here. The insurance claim issue and the therapist calling. In terms of the insurance it sounds like you know what needs to be done now. Is it possible to re-file the claim?
Now in terms of the therapist seeming pushy, if her actions make you feel uncomfortable, perhaps it's just not good fit and ultimately you have a right to decide.
Good luck and please feel free to post again.