Maybe all she needs is a little refresher on understanding how the skill works. It is not about getting your leg over but about learning how to shift your weight. If you start at the beginning, all the weight of the body is on the ball of the foot. During the back bend part of the skill, the weight of the body is on the ball of the foot for balance purposes. When the hands touch the floor, the athlete must push with the leg to shift the body weight from the foot to the hands. The hands must be close to the feet, the chest and shoulder must be out past the hands as the hips/bootie shift through and past the handstand. The legs extend to the athletes maximum split position, not so much for deduction purposes, but because in this position it actually helps with shifting the hips/bootie past the handstand. If the front leg is not lifting, or the back leg is bent, the leg(s) are "dragging" behind and resisting the shifting.
The main concept is understanding that it is about shifting weight to get the hips/bootie over not getting the leg over. If the athlete is focused on getting the leg over, they will probably pike and this makes the hips/bootie move in the opposite direction of the skill and results in the athlete falling back to the bridge or to their back. Also, if the athlete doesn't have control of the balance during the bridge portion of the skill, the hands will end up too far from the feet and make it more difficult (a further distance) to shift past the handstand.
I hope this makes sense and helps your sister!
