I stress that parents seek qualified training and sports-specific medical advice from the beginning of your daughter's sports career. These go hand-in-hand as your daughter grows in chronological years, strength and athletic ability. Do not make assumptions that just because someone is involved in sports that they have your daughter's best interest in mind. Remember - your daughter is ONE OF A KIND. Her physical make-up is unique, and what may be harmless to one kid may eventually harm another - such as a certain pitching motion, the number of reps with dumbbells, etc. These things are key to injury prevention and longevity of your daughter's pitching career. Using "cookie cutter" methods in intense sports training is a dangerous concept.
During her playing years, my DD was fortunate to have a physician who was affiliated with a sports medicine practice. They had MRI, x-ray and all the "toys" that active athletes might typically need right there on premises, including sports-oriented physical therapy. The bonus was that we garnered a ton of sports specific medical advice from the physicians and physical therapy staff. Accordingly, we were armed with educated questions to ask her pitching coaches. Ultimately, it was a team effort, and isn't that what softball should be about anyway?
I realize that this approach may not be available to everyone, especially in smaller towns. But the key concept is the same - strive for assembling a team of professionals - medical, conditioning and coaching - who can get to know your daughter's specific needs, and knows the path she is on.