L.L.
My daughter had a bully problem when she was in Kindergarten. She was hit, pinched, pushed, etc. I told her to ask the girl to stop. It escalated to more often. I went to the teacher and told her about the problem and the teacher kept a closer watch on the situation and did a better job of keeping this girl away from my daughter. From my experience bullies only bully people that they want to be more like. Your daughter is sweet and kind and it's causing her to be picked on. Tell her to stand up for herself. If someone is picking on her, tell her to say in a loud voice, please leave me alone, if nothing else this will get the teacher to take notice that there is a problem.