also make sure she brings her arms all the way up by her ears--the higher the arms go on the set, the higher the flip goes. .
That's not true at all. If you don't believe me, go look up Liukin's triple back on YouTube and tell me how high his arms go. They're not even close to being by his ears.
The "old school" rationale is that lifting the arms up next to the ears will help one to attain more height. The only way that it would even remotely assist you is that lifting the arms overhead does raise the initial position of the center of mass slightly. Unfortunately, by also lifting the arms overhead, you lengthen your body (increase in moment of inertia) and this will actually cause you rotate slower.
However, the biggest dilemma is the fact that when the body is moving in a tumbling pass it has a certain amount of horizontal momentum (mass x velocity). Well, since the human body is not a single, rigid segment, the velocity is distributed across the different links. What tends to happen when you swing those arms up by your ears is that the resulting momentum of the head, arms, and torso (HAT) continue to move slightly backwards once the feet are planted just prior to take-off. This occurs because the combined mass of the HAT has a significant amount of inertia (resistance to change in motion).
Since the HAT continues to move further backwards once the feet are planted, it actually causes the center of mass to move too far behind the base of support (feet) and this affects the angle of take-off. So, this results in a low, flat trajectory despite the fact that there is typically sufficient rotation.
The best approach is to lift the arms somewhere between directly straight out from the body to approximately 45 degrees relative to one's straight line from eye level. Essentially, you're consciously stopping the segments and in theory the resulting momentum should transfer to the rest of the body.