She probably needs to leave her head and arms back more rather than angling in coming up, unless it's a flexibility problem (if she sometimes make it I would guess not, but hard to say really). However I would caution against practicing a lot at home, FWOs are hard on the back and it isn't worth risking overuse injuries for something that will click in time. Often what happens is quantity over quality and practicing the same things wrong without the use of mats or other visual and physical aids that she has in her gym class probably won't be worth it. It would be better to focus on moderate stretching and some strength exercises in order to improve her overall performance and maximize her time in the gym.
She will get it soon enough! Good luck to your dd and to you, have a great 4th.