If you have a few hundred models, I wouldn't say that any particular model carries a specific weight as to get members to join.
I would look at the initial cost, add to that the time and cost to dig up all of her photos you have, to package them/burn them on a DVD or however she wanted them "returned" and send it to her. What will that take you, half a day or so? What's your alternative cost for half a days work, how much do you usually make in that time doing something else productive?
I think it would be fair to give her a chance to buy them back, but set a high enough price to kind of "scare" your average model away from doing it time and time again. On rare occasions I can see that people might have their own reasons to do things. Offer her a somewhat steep price, to cover all your costs and time to gather it all up and let her decide if it's worth it.
But as Jim Gunn brings up, some of the images might not be in your control, as long as she knows and understands this, let the decision be hers but let it also come with a high pricetag.
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The truth is not affected by the beliefs, or doubts, of the majority.
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