Oh boy, here comes the experts. Ok, so here goes clowns. Since she had ACL surgery, I WILL NOT have her do a touch and go box squat. Goes down, sits rolls front pelvic tilt and back up. Tempo is 4-0-0-1. One- doing that way builds explosive strength, the front pelvic tilt strengens hip flexors and low back, the pause on the bottom (sitting on the box) saves her knees by taking stress off.
Also, doing that way the bar is NOT that high. Schools out. Make sure to do your homework tonight. Especially before making naive comments like that. It's not olympic lifting or bodybuilding.