This must really be a stressful time for you and your daughter!!
The fact that the bully still punched your daughter in her tummy AFTER the verbal warning, tells me that she's not going to stop. If I were you I would go and see the principal, tell him/her that its really unacceptable and that you want a meeting with the parents of the bully. If there's a history of aggression they need to send the child to counselling and take her out of the school.
Hi there, I'm really sorry for what your little girl is going through. No one wants this to happen to their LO!!
Mabe you should ask the teacher to arrage for a meeting with yourselves, the bullys parents and the teacher. Do you know if the parents of this child have been contacted and informed about the things she's doing?
She is a danger and a very agressive child and this needs to be taken seriously and not just a light verbal warning!!
Writing a letter is not going to sort out the problem. When Tanja was in Gr2, she was also being bullied. After she came home one afternoon crying, I stormed into the class room the next morning. I demanded to see the boy, Martin. The teacher asked me why. I told her as his parents does not want to teach him manners, I will. I told him in front of everybody that if he comes near Tanja again, I personally will give him a hiding that he will never forget. He never bothered Tanja again. I would go to the child's parents house and let them and her understand, if she comes near Micayla again, a charge will be laid. If it doesn't stop, go to the police and lay a charge, because then the child needs help.