You might be asking your friend at the lab to place himself in legal jeopardy by printing those files she lifted.
This may or may not blow itself up into something a whole lot bigger, but if it does, he could be held liable for copyright infringement as well.
If it did go to court, he would undoubtedly be called as an accessory to the infringement. He would definitely have to have legal representation which would be costly.
Some, if not most, photo labs have policies about printing files that do not belong to you and if your friend is a reputable printer, he will probably have a similar policy in place.
This individual that wants your prints for nothing is just thinking about herself and not you. I would cut her loose and have nothing more to do with her if I were you.