Agree - swimming glove hand and stride off to the side.
Draw a powerline when she is full pitching so you can both see where her stride is going.
For the glove 'swim', have her do full pitch motion but at the release, pitch the ball into her glove. If you are swimming the arm you can't do this or it is very, very difficult. My DD had this issue and did 50 of these each night for a week and it went away. She still does this once a week to make sure the glove arm is in tight.
It will look like a whole different pitch when she makes these two changes.
Draw a powerline when she is full pitching so you can both see where her stride is going.
For the glove 'swim', have her do full pitch motion but at the release, pitch the ball into her glove. If you are swimming the arm you can't do this or it is very, very difficult. My DD had this issue and did 50 of these each night for a week and it went away. She still does this once a week to make sure the glove arm is in tight.
It will look like a whole different pitch when she makes these two changes.