If a pitcher has been doing this awhile, here is what you can do.
Take 6 thumb tacks and put them in a straight line one inch apart on a table, points sticking up..
Take an 8 inch piece of duct tape and tape them to the table pushing the points through the duct tape.
Now, peel up the duct tape and tape the thumbtacks to the outside of her glove, where the glove comes in contact with her leg.
Ya got to make them think about it and not just pitch from habit. Pitching from habit is not pitching, it's throwing. If she comes down with that glove more than once, she either likes the pain or she is dumb as a box of rocks. This definitely stresses the point that the glove coming in contact with the glove IS A BAD THING!