Paying attention to where the hits are going can be a clue as to where the pitches are located. If she is hitting the low outside corner the solid contact should be to right field (assuming RH hitters). What does she say about the pitch location when it comes to solid hits? Educating her about this will help her development as a pitcher. Certainly mixing in fastballs will make the slower curve more effective, the coach should know this.They were making solid contact on the ball pretty consistently.