MILgymFAM
Proud Parent
No, it's not the long legs. Plenty of leggy kids get their squat on quickly. We had a kid make the same mistake while learning squat-ons this summer. She has it fine now (no privates, just refined it in practice). It is a fear issue, despite what she says. She is afraid of getting her hips high enough to squat on properly, because it will cause her more of a lean.
Yup, my DD is 5'5 and all leg, she got her squat on first try, no issues... It's gotta be something other than the legs.