(Just to play devils advicat )I think I would talk to my vet and see about boarding it there (don't need to give the guys address unless cat acts strange) and if they start to show signs then have the vet call the guy but if not then he can help you find a home for the kitty. If the cat does have rabies ( maybe the kid didn't do any thing to it) the sooner she gets the vaccine the less damage to her body.
Not to place any blame on any one or thing just a thought I have ok Please no one get upset ok.
We all love the critters who get blamed so often when it's not their fault but we do have to remember it is not always that way. What if some thing happens to the exceptions how would we feel ? Knowing we had the answer right in front of us and a youngster (example this girl) gets very ill or (god forbid ) dies .

Just my thoughts and opinion.