I'm so sorry that you're enduring all of this. You need a therapist who is supportive, she clearly is not. One thing ( of many) that sends up the red flags for me are the receipts that she is not sending to your insurance. I'm wondering why can't she just give them to you at the end of each month so that you can send them in? That's the part that seems sketchy to me. Why wouldn't she just give them to you if she can't be bothered with it. I certainly don't want to add to your stress but I'm wondering if she is doing something fraudulent.
If it were me I would call my insurance company and let them know what is going on. Like others have said, send her a certified letter letting her know that her services are no longer needed and you EXPECT copies of all of the receipts that SHOULD have been submitted by her when she said she would submit them.
Again, I'm truly sorry for thos awful experience that you've had to endure.. please don't go back to her anymore.. you deserve much more