My DD is the youngest in her group by 3 years. However, our level 4's and 6's have practice at the same time - they practice separately, but they condition together. Since a lot of DD's best of friends are still Level 4's this works out well for her.DD is also a firecracker; it doesn't take long for her to open up and assert herself. She gets along pretty well with the older girls in her group, but others are right - it's hard for those girls to completely relate with my little 8 yo. When the competitions during conditioning happens, the girls are split up into 2 or more groups (usually several). They range in age and size and are all mixed up. It becomes a team competition then - they are all cheering for the girls in their respective groups. I think conditioning contests like this build camaraderie, instead of fueling individual competition for the sake of competition. DD has been on the receiving end of hurt feelings though, as she was the new kid not long ago, plus being so young, the older girls would exclude her (or dare I say bully a bit) initially. Or tell her she was too small to be on the high bar, even though the coach would give her approval. Most of what I saw happen was in the context of open gyms (because they wouldn't in front of their coach). However, these girls have worked out the kinks. They have all grown up a bit which helps too. They support each other every day and really have become like family; DD just happens to be the little sister

(and NOT the best friend).
I'm guessing gym comes easier for your dd than most, and the girls were cheering on the under dog. As they built-up the other girl they were probably completely oblivious that they hurt your dd's feelings; This has nothing to do with your dd's personality. The girls were just being a bit insensitive.
^^ This. I think most people are inclined to cheer for the underdog. At the end of the day, I think there are a lot of reasons that this could have happened and I will say it - girls are really not as nice to one another as they should be... BUT, from what I can tell, that in the gym this is usually a short-lived issue, versus the ugliness that can be found within school hallways for example. ( I would HATE to be a 13 year old again... ugghhh)
Sorry your DD walked away feeling bad about the situation. I am hopeful that it was just some insensitive kids not even realizing what was going on, versus an intentional attempt to hurt her feelings.