Not Playing Nice

Well, Anna had a bad day at school today. Apparently she's had several bad days lately that she hasn't told me about, which explains why she had the mysterious "I just don't feel good" this morning while she begged to stay home. Apparently the girls at school are not playing with Anna. She said she asks them if she can play and they tell her "no". Ugh! I hate that! Why would anyone not want to play with my sweet little angel? Ok, seriously, nobody's perfect, but can't they all play together nicely?? Anna's two best friends from last year are not in her class this year, so she's sad about that, too. What's a parent to do??