How did she react after you explained the situation? They always go on the defensive and think we are out to get them any way that we can...unfortunately, it's usually the other way around and they expect us to pay for quite a lot.

I think you did the right thing. Your xw needed to know that you had already spent quite a bit of money repairing your daughter's car and that expenses needed to be discussed in the future. If you set a boundary...adhere to it.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.