Looks like it's all being sorted now. Headache (just about) over!
Did she come clean?
If she doesn't, it might be worth an empty threat about reporting her to the police. Some yadda yadda about CCTV footage etc.
If she wanted to completely get away with it, she'd have not bothered leaving a note, or even just writing something like "lol I hit your car" to appease nearby witnesses.