That's what I was thinking also. I don't know anything about the palm down curve. No clue how to teach it. Her change is very good but needs something to go with it. Do you keep the palm up also?
They should look different enough that you could potentially keep both. If you have a baseball background think of the palm down as a slider. However, I would be sure she throws both well enough that they are effective or get rid of the one that isn't a quality pitch. At her age there is no reason not to work on both and see if one or both ends up being a high quality pitch. I know I think differently than some here, but I say try almost everything and see what she naturally does well. Once you see what 2 to 4 pitches she really throws well in a couple of years trim down to throwing and working only the best ones.
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Change is good. Curve is average but consistent. Turn over drop movement is very good but not consistent from day to day. Screw movement is very good but inconsistent from pitch to pitch. Rise shows some potential at times. Doesn't throw hard enough to be a top 14U pitcher 53/55.