Falling out of stance

[Pride14]

As a coach and dad having my daughter been through a lot of hitting lessons. Her swing is dialed in pretty good and is crushing the ball. The only thing is she doesn't keep her feet planted after the swing, falls out. Any drills or fixes for that

 

[hummingbird]

If I recall correctly, there was a video I saw that explained a loss of balance after a swing is usually attributed to the batter not keeping their head still on the swing.