My first thought on this is although she loves school, she is jealous that dcg gets to stay home with you all day without her. My dd was kind of like this when she started school. She wasn't bullying but was very clingy and wanting all my attention when she got home. I found that it was a mixture of jealousy and being tired. One thing I found that helped a bit was to let her do the craft that I had done with the dcks that day so she didn't feel like she was missing out and read her some stories with her on my lap..it took a while but she got over it. She loves being home on PA days and helping me with the little ones now.