Ok so the other day, going to get some CC dry for Paul I was in a small accident with a Toyota corolla. Lol!
Basically we reversed into each other as diagram shows.
We both had started to reverse out of our bays and bam!!!!(see diagram:P) I'm the blue car

If she was in her spot and not moving, then yes it would be 100% my fault, but she was moving out too!!
When I looked at the damage my car had nothing:). Her car however had a broken tail light and two small dent on the bumper that's easily fixed by a second hand tail light, some heat on the plastic bumper and some paint.
Since I know a good friendly cheap panel beater I told her that i'll get her car fixed and we agreed that we were not going to go through the insurance.
So I gave her my details and I took hers and got her to go the the panel beater.
The panel beater told me that it would be an easy fix and that she also wanted to fix the other side. She a P plater and had covered the car with dents and marks.
A few days later when i was a uni, i didn't answer my phone and got a voicemail form and insurance telling me that there was a claim and that they will send me the bill. I tryed calling her but no answer, I called a million times during the next few days and nothing. Pretty sure someone told her to do and insurance job and she will get a new bumper etc etc as we all know and that she will get the other side fixed free!!!.
So now I can't contact the insurance as it was a private number that called and she isn't answering.
My question is, How do I know if I'm at fault? is it 50-50 in a parking lot?
Oh and I didn't have insurance on my car:S
I will be happy to pay if I'm proven wrong and to be the one at fault, but I don't think that its fair in this case and that I'm 100% at fault here. I could be wrong. What do you guys think, suggest? What can I do?
Thx