what you could've did was this, tell her to let you fix it yourself; you work in an auto-shop & deal with cases like these everyday. Tell her you would've offered to fix it but didn't have the time; however, now you do.
here's the biggie...ask for the $150 back & tell her that you usually do a job like this for $200. make it look like she's getting a deal. offer to fix it yourself.
go to autozone, buy some paint scratch remover for less than 10 bucks, spend a good 2 hours "working on her car". you have to really rub hard. bring extra materials making it look like a big job. so really what you do is for the first hour and a half, tell her you applied some stuff to it to loosen the chemical bonds between the molecules and it needs time to penetrate. tell her there's like 4 stages. you "usually" only do 2 but since you want to do a good job you do 4 "stages". The last half hour, you actually rub the hell out of those paint marks with that scratch remover & call it a day.
---> this is assuming there's no physical body damage & it was just a paint transfer....
