I absolutely HATE bullies!!! Having said that, have you tried talking to her teachers or the school principal? Maybe a chat w/ Cristina's mother? Sometimes, parents are unaware of their kid's behavior until it is pointed out to them. Maybe have a meeting w/ the 4 of you (you, your daughter, Cristina & her mom), figure out why this is happening. If it continues to happen after having a meeting, then maybe it's time to step it up and advise the teachers and principals that they need to start enforcing "bully" rules (most, if not all, school have this!), and start holding them accountable. They are responsible for your child while she's in school and they need to know that you expect the same discipline taught! Keep records of who you spoke w/, the time and day, and if that doesn't work, go to the scool board or look into speaking w/ school inspectors (they actually have such people) and give them the scenario. I'm sure all will get resolved, I just hate knowing that your daughter is going through this. Good luck!