Stephanie - if she wants to pitch I think you take her to a pitching coach or at least someone who knows pitching mechanics. A couple of things that are obvious a) she takes a step with her right pivot foot before she drags it (illegal); b) she is leaning way too far forward; and c) after release she is pulling her throwing arm back behind her instead of finishing out in front of her body.
If you don't have it, buy Bill Hillhouse's dvd which is excellent for the beginning pitcher. She has a lot of potential but must build a good foundation first to work from. I'm a firm believer that you cannot dabble in pitching; you either commit to it fully or you play another position. Its just too complex and competitive to go at it half heartedly. Good luck.
a) she takes a step with her right pivot foot before she drags it (illegal)
She does lean. She knows it, and it has actually gotten better. But this video helps to show her she still has work to do...
As far as rolling the ball...what would help? Someone mentioned to have them hold the ball in the tips of their fingers. Would this work?
Stephanie, the pads of my fingers are on the seams. I tell the girls to put their fingernails right on top of the seams.
It isn't much different than throwing a 4 seam fast ball, overhand.
(I wonder how many times I can say the word "seam?")
I am guessing that you know that the ball doesn't sit back in the palm of the hand.