Third grade has been challenging. I hear the same from other moms of 3rd graders - suddenly the academics get harder and the kids (especially girls) are trying to figure out the whole "social" aspect of being a bigger kid.
We are happy that Grace has a few friends she can count on at school and in the neighborhood. And, we try to encourage some new friendships where we can. Grace tends to be quieter and more reserved when she is unsure of herself. So, having friends come to our house makes it easier for Grace to relax and be herself.