Did she look good? You said she was your age, I got lightly tapped on the rear bumper by a hot babe who was 16 back when I was 19 , it didn't do anything to my 94 Mazda truck, or her car, it was at a red light and she tapped me at walking speed. She was shaken a little bit, we swapped information, she called a day later apologizing again and I was glad too because I asked her out and 2 weeks after that I got to tap her rear bumper. We dated for about 3 months, damn .... your fender bender situation brought back some good memories. You made one bad mistake, NEVER tell a stranger in a wreck that you have shit in your car! All they have to do is tell the cops that, especially in a situation where they are in the wrong, if they think of anything that they can use to take attention away from their fuck up and put the spotlight on you, they most likely will do it. That's the only bad mistake you really made, but yeah judges do look down on people who flee an accident, and I used to live in Georgia and there if someone hits you in the rear you can win against them in court.
I don't know what she said to the cop after you left , but not getting to tell your side at an accident isn't a good situation even if the evidence points at her being at fault. I have no idea how this may turn out, leaving the scene like that probably had an affect on her wanting to try to spin things around and try to fight you even though she's at fault. Friends she told about the accident could have persuaded her to try and fight you, leaving the scene like that looks suspicious and most likely if you had stayed and NOT told her anything , then told your side to the cop then I'm 100% positive there would be a closed case to this event. I can't stress enough, NEVER tell a stranger you have weed in your car, especially when they have the incentive to use that information against you to lessen the soon coming cops attention against them self by shifting the attention on you.