You should stay out of it because there's nothing to gain by doing anything but reassuring your child that she can do this. Her's two quick thoughts about the futility of chatting this up with the coaches........
They either know how to teach the skill, or don't. If they know how to teach the skill, they'll certainly do what they can for your dear daughter....... so talking to them isn't necessary. If they don't know how to teach the skill there's nothing gained by talking to them, and you run the risk of being *that* mom.
So how do you know which is most true........ do they, or don't they, know how to the skill. You can figure this out for yourself....... if more than a few kids with the same experience as your child are doing a decent bhs, it's reasonable to say the coaches are capable. The same may hold true if the entire group is struggling but are relatively young with little experience, and when the first couple of kids get te skill, the rest may follow.
There's potential for kids to feel this skill is beyond them because it is the first backward and upside down flight skill they encounter. The best way to avoid the block is to surround the kids with the positive expectation that they will learn the skill, that the skill is reasonably safe, and that they'll have it and keep it for the rest of their gym career. Really, it's a skill they've done thousand's of on the floor, on the floor line, and various versions of floor and padded beams, and there comes a time where resolve is more important than correction.
If you trust her coaches, tell her to do herself a favor and trust them as well.