I would absolutely follow up with the Animal Control people - be friendly and curious, and ask if they've "gotten a chance" (implying you know they're very busy and giving them an easy out if they've forgotten) to visit, and what they found if they did.

Also, if you're going up there, I'd bring a box of (nutritious) dog biscuits that you "got on sale - so I thought you could use them" and give them to the child and tell her to give doggy one after every meal she (the child) eats, so they can be friends together. At least then you'd know she was getting something decent to eat.