would having them sign a "release" form truly release me of all liability in this situation? It seems like if you damage someones car you are still responsible to fix it,if its your fault. Or is this not correct?
also what if she refuses to have the work done by a mobile tech and insists on a bodyshop?
Isn't getting them to sign a release at least worth a try? If you do work for a truely litigious client, there is nothing that will stop them from suing you. You cannot stop someone from suing you. Whether or not they win is a different question.
If that is the case, then you will only pay what it takes a mobile tech to fix it. If she insists on the body shop, she pays the difference. Stand firm on this if the difference is significant.