I believe that style has some bearing on pitching but the bottom line is, If you dont put the in the time to be good it doesn't matter what style you throw. Im sure Monica Abbotts style isnt taught by to many instructors but she was one of the best in the country. It was because she found a style and worked many, many hours (more like years) at it. My advice is find a style that your DD is comfortable with forget what all the thousands of masterminds and pitching instructors on this forum say, and put in the time (not 30min at practice and 10 min before the game) but the 4,5,6 nights a week 100 to 150 pitches each night and your DD will be able to throw strikes and place the ball where she wants. This sport is not rocket science like we try to make it. If we get back too starting these young kids out with strong fundamentals, throwing properly, watching the ball to the bat, fielding your position, all the fancy stuff can come with age and maturity. In this sport we as parents cant keep bouncing kids from one instructor to the next and hope that each will make her a little better than the last. Find the one you AND your DD are comfortable with and trust, and put in the commitment of time (lots of it) and the hard work enforce what the instructor(coach) teaches in your HOURS of home workouts and you will see the efforts pay off.
Just my 2 cents for what its worth,
LUVFP13