I've gotten good advice from this thread but none better than sequencing and intent to hit the ball hard both related. If we had to do it over again I might do it differently but now she understands we want good mechanics but it's equally important to hit the ball hard with proper sequencing. We played four 10U games yesterday in three of them the pitchers were throwing high 40's. Her home run was against the slower pitcher. Her approach against the faster pitchers is that she is swinging at every pitch until she is not. If it's bad she has to stop. We say it's easy to hit and hard to stop.
Sequencing was something my DD was missing as well. Once that was figured out things started to come into place a lot faster.