If the skill has not been repeated enough,it's not committed to muscle memory. So if she moves too soon from one skill to a new skill (or sequence) she can have problems with her body deciding to repeat what it did yesterday instead of what she wants it to do today. I guess you could say "it's definitely possible to likely."
You dd's dilemma may (if this is happening for that reason) be a great example of what takes place in the learning process. The first step is usually ignoring what the coach says in favor of doing it the way that makes sense (gymnast's mental model) and from there slowly acceptthe coach's model.
Once they've accepted the correct model for the skill, they'll start doing something that closely resembles the skill they say they're doing. You could say, at this point, they've learned the skill but are refining it so the mechanics are exactly what they should be. This is when, once refined, you can say they've learned the skill, but haven't committed it to muscle memory because muscles only remember the "one" that gets repeated....... like maybe 500 nearly identical repetitions with no "wierd ones" messing up the muscle's "concept" of the pressures, directions, speed, position, and timing that are (more or less) unique to that same skill.
Consider it similar to being introduced to a new group of people who spend 15 minutes together working on a project. It takes a while to earn just their names, and then some time to understand their sense of homor, and then, and then, and then........ through a series of nuances. It's only when you've committed each person's traits into your relation ship memory that you can consistently get the most benifit for your effort and time........ Gymnastic learning works kinda like that, sort of.
A new skill that goes upside down (in an substantially different way) that shares a few common traits, like back salto after a bhs instead of a bhs after a bhs. The coach possibly saw a few problems and has reacted by not working them until the kids really have it. Consider it a test to see if your dd had really learned the skill, and the results prompt the coach to pull back a bit and work th skill a while longer.
There is a bit of an upside in this for your daughter in the sense that she now has another thing to learn..... the difference between what works for a bhs, and what "sorta" works for a salto. During the relearning process she'll learn more than she knew existed in the bhs universe, and that's always a good thing.