Quite simply put, it is your daughters fault as she was not looking where she was going.
However I do take to task those who say that "if you hit a car on the rear end, you are at fault!"
I was driving along the road, speed limit 50Mph, going 50Mph. Some idiot came up behind me and drove very close. I Ignored him, and continued on, at 50. He eventually overtook, pulled back onto the correct side of the road very close in front of me and made an emergency stop. Was it my fault I ran into the back of him? (Actually I had been expecting it, and waved as I went past him, but had I hit him?)