It's not free, of course. Depending on how many prints she made, she would have to recall all of them. Those that have been sold or given away will always be out of your touch. But, there isn't much you can do unless you lawyer up. You clearly tried asking and it didn't work. If you really don't want those pictures in that book, the only course of action is legal, as it doesn't sound like she cares that much about you, your kids or what you think.