Ok maybe it me or my mommy radar is going off, but Olivia has been coming home for the past two days…

Ok maybe it me or my mommy radar is going off, but Olivia has been coming home for the past two days just sad and not feeling like she wants to go to school. She usually excited to go and gets sad and mad when she's had to miss school. As well as coming home.

The little girl that's in her class and that lives in our apartment complex stop coming over as well. Today she came home with her backpack full of milk and gun on in her chest and back. Note she was wearing two shirts today as well as her winter coat. Should I be concern someone is picking on her at school or let it go cause I'm being over protective ?