2001 Ford Taurus

My teenager backed into our neighbors ford taurus and cracked the drivers side headlamp and a crack into the casing behind the headlamp located under the hood. There are also two dents in the side panel one about the size of a dinner plate and the other maybe the size of a fist. It is hard to tell which dents are ours and which dents were already there as theyve been bumped before. Our neighbor said she did take the car into someone who said they'd have to replace the bumper but do not see how it involved the bumper at all. She is willing to just take cash from us to settle so we don't have to claim it on our insurance policy but we don't know how much is reasonable. Would you be able to give us even a ball park figure? Any help would be much appreciated.