J.J.
There aren't as many modeling agents as talent agents that handle modeling. Try Core Talent, The Campbell Agency, and Kim Dawson Agency. They all represent kids. Just be aware that this is a profession, and not just something to do for fun. If you get an agent they will (and should) expect you to go an auditions and casting calls on their schedule. You rarely get much lead time. And don't waste your money on getting professional headshots before landing an agent because if they sign your daughter, the agent will want to help pick out wardrobe and the particular look and even which photographer to use for the real headshots. Just send in cute snapshots to submit and they'll call if they are interested. Just remember these places can get hundreds of submissions each week. It is NOT a poor reflection on you or your daughter if you don't get a call. It is a sheer luck and numbers game, especially at that age. I am an actress, and have an agent myself; feel free to email me if you have questions. I am happy to help someone so long as they are actively helping themselves also. Good luck.