I concur that it is probably the high math/higher intrinsic ability group. On the plus side, your daughter will probably get used to the accents over time, and, if the kids are recent immigrants, or non-native speakers, their language ability will skyrocket in just a couple of months (my son went into pre-k practically without speaking any English). Of course, 8 girls is not a lot, but some kids are in classrooms with just 16 kids, say, so also don't have more classmates of the same gender.