The good news is.....she will never use this "skill" again after level four.
The bad news is..... this will be one of many skills that she will struggle with. SO therefore it is good for her to learn how to deal with the frustration. Many skills are "got" and then lost for days, months and even years!!!!
My DD got her kip when she was 7, it wasn't a skill she needed at the time so rarely worked at gym, she lost it tte next week and didn't get it back until she was 9 !!!!! She got it for when she needed it , but it drove her bonkers.
Little DD was the best vaulter in her level last year and until after her first meet this year, since then however I think she has managed one good vault alone, she even splatted at her last comp on both attempts (deduction of the whole score

).
At this point I am very pragmatic about the whole gymnastics thing, as injury, mental blocks, fear, growth and even more injury can all get in the way of "progress", it's life, smile move on. Let them know it's all okay and the skill will come at some point.