I am not a lawyer. That said:
Whether anything this woman wrote violates the law or gives you grounds for a lawsuit is probably a subject better discussed with a lawyer than with a group of amateur writers on a forum. If you're an American, this would be a matter of state law, so even if I knew all there was to know about the subject in my home state, it might not apply if you live in a different state. Double if you're in another country. Etc. That said:
What is your concern?
Did she say things about the children that would embarass them? If she said things about them that are false, this could rise to the level of being "libel", in which case you might have grounds for a lawsuit.
Did she say things about them that could put them in danger? I'm not sure what that would be, but if so, you might have some grounds for a legal objection.
Is it simply that you object to the violation of privacy? I think -- and let me repeat that I am not a lawyer -- that as long as what she says is true, and does not violate specific provisions of state privacy law -- that there's nothing you can do.
In my home state of Michigan, it is illegal for a library, bookstore, or video store to to publicly reveal what books, videos, etc someone has borrowed, rented, or bought. It is illegal for a bank or similar institution to reveal your financial information without your consent. There are limits on government release of information about you.
But that's about it. If someone writes an autobiograpy, he is inevitably going to talk about people he knows and things they did. If he lies about you, that's libel. But if he tells the truth, he has every legal right to say it. Think about all the things reporters publish every day about politicians and celebrities. Do you think those folks gave their consent to everything said about them?
If it's a self-published book, odds are she will sell somewhere from dozens to a few hundred copies. It's unlikely that the children's future employers, spouses, etc will ever see it unless you go out of your way to publicize it.