I think it's a safe enough endevour. I mean the streeses from squats are probably duplicated in many thing kids do already; like jumping, gymnastics, wrestling, etc.
My only issue is having your kid compete at such a high level at such an early age, especially in a sport where she will reach her peak 20 years from now. Slow down. Teach the kids body control, technique, and be progressive...but don't have them going for maxes at such an early age. I've seen videos of here squatting where her form was absolutely scary, certainly an area that could be addressed before pushing things too hard.