So after observation this week, I noticed a couple things:
1) My 10 year old is super social.
2) She has one girl her age who isn't nearly as social.
3) The girls mentioned are a year or two younger than her.
4) There is another set of girls a year older than her.
So, just with those observations, I realized that she is sandwiched between both sets. It puts her in an awkward situation, but temporary.