Hitting mechanics

If she is hitting HR's and for power (triples and doubles) then the launch angle is more then likely more geared towards line drive and fly balls. So she is popping the ball up because the swing plane and pitch plane don't always match up well.

FiveFrameSwing said:

3: A hitter with a 600+ BA, that hits a HR 16.7% of the time, and has lots of triples, is either very good … or, more likely, someone that is playing at a level of competition that isn’t challenging them sufficiently. If you truly wish to get better, then play at a higher level … either at a higher classification level, at a higher age level, or both. Playing at a higher level of competition tends to reduce one’s batting stats and improves one’s desire/need to learn. Conversely, playing at a low-level tends to promote compliancy, false confidence, and bad habits that can be deeply embedded into one’s mechanics … making corrections more difficult in future years.

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This was my first thought when I read the OP. DD's first year of travel ball was 2nd year 12u. That was the one and only season that she played rec ball and travel ball in the same year. During the rec ball season, her batting average was .833. Was she really that good or was she facing weaker pitchers? While I like to think she was an above average hitter, the truth is the pitching was nothing more than batting practice. That season in 12u travel ball her batting average was .395. Still respectable, but a significant difference.

If her mechanics are sound and just need to be 'tightened up', I see no reason why that can't be done during a season. However, if her mechanics are lacking and she is simply beating up on weaker competition, it may take a little longer to make her swing scalable with the higher level of competition.