Help!? Should I get a repo?

I co sign a car loan for a friend. It's a 03 mazda, just last year. I kept getting letters of past dues. A few months ago she got into any accident(not at fault) but both parties are not insured. Huge damage but drivable. Yesterday I received a letter from the auto loan of another past due of $1300. That's 3 months of not paying for her auto loan. What can I do as a co signer and I don't want to end up paying for it. I don't have that kind of money. Should I get it repo or what's my option? Am I reliable? PLEASE HELP!!!! IF ANYONE KNOW ANYTHING ABOUT THIS OR ANY ADVICE AT ALL...=(