I try to fully inform my models, and be as upfront with them as possible, that by doing a photoshoot with me, ANYONE is possible to see these pics of you now or ten years from now or whenever and whatever I want to show them sell them etc..... I cover this in great detail. on video, and have them initial every paragraph of the release.
If I feel that if there is some hesitation, I send the model home and make her come back a second time to be sure that is what she wants to do.... ( I can always find another model, and prefer to have only smiles and good things said when dealing with models at the present, or in the future)
I find you get more bees from honey..... and the word of mouth referalls bring me way better talent than the advertising in the paper does...
But like was pointed out ...if you have the proper docs, and she accepted payment in full, then she really has no recourse ( I would leave out the fuck off part though)