I almost never post here any more because I've been crazy busy, running the Growing Math Project but today I was answering an email from a parent of a talented little athlete and I thought my ideas might be of interest to other parents and coaches as well.
From loads of experience seeing many, many kids - she is nine years old and kids pick up on what their parents think is good, right up until they become teenagers and think you are out to ruin their lives. Most likely, your child is working hard at their sport because she believes you value it.
I used to think it was a negative to start early but I started in my very unscientific survey asking people I ran into who were world or Olympic gold or silver medalists and there was zero correlation with how young they started from age 3- 12. Very, very few started after 14 but I ran into people who started at 3, 5, 7, 11, 12 - there didn't seem to be any advantage or disadvantage in starting earlier.