DD is 2, nearly 3. Today when collecting her at nursery I was told she had been violent to another child. Child 1 was lying down on the floor, DD and child 2 went over and tried to hold them down so they couldn’t get up. When they tried to get up, DD and child 2 started hitting them until nursery staff intervened.
I’m absolutely devastated, we have never had a bad report about her before. I was only saying this morning how kind she is - she says ‘sorry’ if she accidentally steps on your foot, pretends to feed her cuddly toys snacks etc. She’s never been violent at home. I suppose if she had hit another child in self defence or because they had snatched a toy I could understand why it happened, but it seems like she thought it was all a big joke 
I’ve requested to watch the footage next week, we told her off when we got home and reiterated that hitting is naughty and unkind. For the rest of the evening she’s been really upset saying ‘I hit another child’ and crying.
I guess I’m just looking for reassurance that my daughter isn’t a future bully and I haven’t failed as a mother. I can’t stop crying and I don’t really know why, I’m just shocked I think. Any wisdom gratefully received 