How,should I approach this? I'm not the one covered but they are holding me responsible for the whole accident.

On Oct.9 I was making a left turn and then a pretty old Toyota car hits from the side when I was driving my dads F-150. Now I owe more than 2000 dollars in damages to the subrogation and then I have to wait for the medical expenses. My name is not on the insurance plan, and I know I have to take responsibility....but I feel like the other driver is faking pain for I tried to settle this matter outside from the insurance for more than the 2000 dollars originally. Whenever I talked to her one time she out of nowhere said she was in pain and I felt that was fake. Another thing, is there anything else I can do to try and prove that the other driver is partially responsible when the carriers decided that i was at fault, I mean, am i allowed to search for camera's around the invironment?