That's up to the kid and the mom. If you think she can handle a Camp, and if she'll be safe around the animals, I'm open to the concept. We have had small children here before, but just for visits; they haven't stayed for Camp. The horses are good with them. Question would be how closely you can watch her and how comfortable you feel.

Maybe an overnight for the first experiment, or dad or a friend comes along to kid-wrangle so mom can have some Camp time? Teacher S has a child's saddle and ample small-kid-teaching experience, though I'd ask her if she has a minimum age/size. Probably 4 or 5? 5 is getting to ready-for-pony-riding age.