Hi
It sounds that her poblem is the standard kip-cast connection problem all kids (well most i guess) go through. Once they snap the leg to the bar the kick/drop their legs down.
What your daughter needs to do is. Once her leg touch the bar she needs to drive them up towards the ceiling as she presses down on the bar (which from what you say, it sounds she has enough strength to do well). While doing this she must use her stomach muscle to try and hold her toes up. So that as she pulls over the bar and leans over she sees her toes or just glimpses them.
Most coaches tell the kids its like pulling up your pants. just upside down.
Have her practice the action, from laying down holding onto something like a broomstick, have her snap her legs to the bar, and then drive them up along the bar, at the same time she is pressing the bar down (hence the pulling of your pants action)..I would use the work press not pull. As she does she will try to rotate over so that she ends up sitting up in a pike with the bar into her hips leaning over it. This mimics the position she needs to finish the kip to cast out of it without a pause (well to cast well anyways). Its even better drill if she does it with weights on the ankles (but only for the drill not for the kip) and she is sitting on the ends of a low boxtop, or raised surface lets say about her knee height.
So that as she is turnining over her legs will be falling down beyond the ground level and she needs to work to keep the pike. If she lets the legs drop down towards the floor in order to stop herslef, then she is just doing what she already does, and its not going to help, but show her what is the wrong thing to do.
It be wise to put a soft mat so that she doesnt have to worry about hitting her heels on a hard surface.
She should do like 10 of these and then try it 5 times on a kip. And repeat. She needs to teach herself the patern.
Most of the time, coaches teach this connection by spotting the gymnast to finish in this piked position and then letting them cast. THis does work and it be good if her coach can spot her for at least 10-20 a session. Until she develops the coordination, strength, and patterning (motor).
What i say is on the assumption that he glide is good. I am also assuming that she is doing the snap part correctly.
But key things :
1- Drive legs up after snap
2- Try and spot the toes once she comes over the bar
3- Work on keeping toes up to cast
Another good idea is she does it on a high bar with straps. it makes the kip action much easier and she can focus on the connection rather then just making the kip and then cast.