I don't think she was saying she puts ants in the cage, I think they were just noticed in the cage with her cham. And I don't think that ant bites would really cause the problems described.
But ants should be avoided. Don't leave any uneaten food, feces or dead crickets in her cage to attract ants. But don't use pesticides anywhere in the cage either because the crickets could get to it. You could try diotomaceous earth if there's an ant problem. It's an all natural pest deterrent, just don't put a lot of it in or put it anywhere where your cham could accidentally shoot it with her tongue. In fact it would be best to put it around the perimeter of her cage instead of in it.
I must say i disagree, an ant bite could do a lot to a chameleon that young