How to deal with bullying at school?

Start by talking to her to get a clear picture of what's going on - what kind of teasing it is, how often it happens, whether there's physical aggression involved - so you understand what's really happening. After that, you bring it to the teacher, which is the first official step and they can monitor things better in the classroom; if that doesn't work, then you go to the principal. Avoid going straight to the other kids' parents without letting the school know first, because it can stir up trouble and the school needs to be involved from the start. The important thing is making sure your daughter knows you're on her side and that this isn't her fault - keep following up on how the situation develops even after you talk to the school.

The order really matters here - a lot of people jump straight to the teacher, but I think the priority is actually understanding what your daughter is feeling and whether she feels safe talking about it. After that, the school has a legal responsibility to act, so contacting the teacher (and if that doesn't work, going up to the principal) is the way to go. I'd avoid reaching out to the other kids' parents on your own right away, because that can end up creating more conflict or even come across as threatening - let the school handle the mediation. And focus on listening to your daughter regularly without pressure, because she needs to know you're on her side no matter how the situation gets resolved.

When a child starts avoiding school, the risk is they'll get even more isolated, so you can't let that slide! The step everyone forgets is documenting everything - dates, what they're telling you, how they're doing emotionally - because when you go talk to the school, you have concrete arguments instead of just "they're sad". After that, yeah, a meeting with the teacher and then with the principal if needed, but with all that information in hand the outcome tends to be way better!