I'd say get a leopard gecko and keep it hands-off from the special ed 7-10 year olds.
Easy to care for, and frequently out in the open for viewing.
That said, BTSs are really freaking cool, give live birth, have BLUE TONGUES! They require a bit more complicated husbandry however, so make sure she knows that.
If she wants the best opportunity for a handling lizard for these kids, a tame adult bearded dragon would be a good choice as well.