Whatever you do, DON'T stop paying anything that's court-ordered. This is REALLY a case where two wrongs don't make a right.
About all you can really do on the legal front is take her to court and get her cited for contempt. Probably all she'd get in the first round is a good scolding from the judge. But if you were also violating the order in retaliation you'd get a scolding also, plus potentially something like garnishment of your wages.
Maybe a better approach would be to offer to help facilitate getting the copies made. There are several services out there these days that transfer photos to electronic media.