Well, you could always get her an adult sized rifle, maybe go to a 7mm/08 which is still an extremely mild recoiling cartridge and more than enough ompa lompa for whitetail. Then, you can take that .243 of hers and drop the barreled action into an adult stock! I'm thinking, don't quote me on this but I believe it's a possibility, that the Rem ADL stock will fit that barreled action right up. But if not, I'm sure there are stock mods out there that will allow you to upgrade that little .243.