The most common problem on a FWO is tucking the head towards the chest as you're trying to stand up. The head should stay back between the arms. The kid should be looking at her hands the whole time until she has fully stood up out of the skill. If she's very flexibility and/or has trouble making this correction, I'd even tell her to watch for her feet hitting the floor before she starts standing up. This really exaggerates the correct head position and can often be easier for a kid to "feel" than just watching the hands.
Watching the hands on the way up also helps make sure that a kid pushes through the shoulders when the hands leave the floor and then retains that shoulder position while standing up. It's easy to let the shoulders drop when not looking at the hands which will make it difficult to get up.
And just because pictures are better than words, a nice pic of Nastia with her head back looking at her hands. Her head will stay in this position while she stands up.
I'm not sure what level your daughter is, but if this is her problem, watch her handspring vault, too. Tucking the head towards the chest before landing will cause some misalignment, the chest can drop during post-flight, and it's harder to stick.