Acciddent, any help?

[twinklecool]

I just ran into an traffic accident... I stopped my car just because the car driving in front of mine suddenly stopped, and shortly after the other one driving behind me hit my car and hence caused my car hit the one in front. Now the person who hit my car is only willing to pay for my car's damage but not for the one in front of mine, and she insisted I have to pay for that car even though it was she who caused all the problems. She stayed for a while and explained to me what she would do for this accident, and left her contact and insurance information, then left away.  I'm wondering if she should pay all the cost for both cars, and should I still call the police even we all have left the place already?

Any suggestion would be really appreciated !