My daughters hit home runs to center & left, but never opposite field (except practice). I just think they generate more power by staying compact and then exploding to get full extension when they pull the ball. This assumes they are hitting inside pitches.
When girls pull the ball even when pitched outside they are swinging around the ball rather than through it. Take them to the tee and have them move the ball inside to outside and correct their swing.
When girls pull the ball even when pitched outside they are swinging around the ball rather than through it. Take them to the tee and have them move the ball inside to outside and correct their swing.