Try having her stand sideways on her front foot, with just the toe of her back foot touching the ground. It will feel like weight forward but looks vertical. Then have her work on her release from that position with a full arm circle. When my pitching students struggle with the drop we go back to this drill and it seems to help pretty quickly.
Part of it can be the release, too. There are different ways to throw the peel drop. I like to have the pitchers turn palm-down toward the bottom of the circle and pull over the top. Fingers are pointed straight back, and the release starts before the ball passes the hip. It finishes as the ball passes the hip. I tell them to focus on throwing a knee-high strike and let the ball do the work. If it starts too low, which most do, I have them bend the elbow a little so the ball comes up a little higher to start -- somewhere around hip-high.
That solves that problem for them. The bigger problem is getting the catcher to call it, especially with runners on base!
After talking with DD's coach last night, he said DD's curve looks to be the pitch he will be calling most of the time. He also won't call a drop with runners on. Is that a common thing? Maybe with 2 strikes don't call a drop I can understand. Now I'm not sure if she should continue to work on her drop as much and start focusing on her curve a bit more.
Sorry to Hi-jack the thread..just curious about the drop with runners on.