Pull up, pull over? Not that unusual for a preteam group but some girls struggle I guess. My preteam has to do ten pullovers at the beginning of their bar conditioning and the low bar is high enough most of them have to pull up first, and some can get a couple without dropping off. Doing it in a row is a little harder but good for endurance, if they can do 5 pull ups and 10 leg lifts they should be able to pull up pullover twice imo. However some kids who are less coordinated and physical sometimes struggle with the mechanics at the younger age without a jump or kick, they will straighten the arms too early in the drop back phase of the pull over and fall off, or they will keep the arms bent too long and not get the pullover either. Or they just aren't strong enough and are still struggling with doing good chin ups and leg lifts in a row without stopping. Obviously the stronger you are the easier it is to compensate for these issues anyway.
It sounds like she has good strength and coordination, I wouldn't say it's normal or abnormal. Some people can develop muscle more easily than others but I've seen girls with less (to a point) natural strength succeed with good technique. And some kids go through spurts of building strength or flexibility. I have always been very strong and had decent flexibility but not great...oddly enough at the age most girls stop getting better at flexibility mine got better. I was working on it more to some extent but I really think it physically got better around that time. I have no idea.