Next time that happens, stick your hand in your pocket and imitate masturbation while you watch the mother. Make sure she knows you're looking at her, try to look her in the eye as you do it. Follow them to the car, and watch em drive off. You'll never see them again ;)

A little girl in my town did get kidnapped from the library. It's small town where you don't really expect things like that, but still it happens. Luckily she was found

Some parents are idiots.

What's really sad is that I know these kind of parents and they will find some way to bitch people out if the OP hadn't helped her daughter then she would have complained about that.

shave your mustache. -guessing you have one-

Why wasn't the mom with her?

Just stop asking them and the over-protective mothers will stop harassing you

You're in a library. Tell her to be quiet or she'll be removed for the comfort of other patrons.

This is the third time it's happened? With the same kid? Maybe you should back off, then.