I know my students bully this girl but I find that she brings it onto herself so I don't do anything
Do you not think bullying is harmful?
Well, she does antagonize them
That's not an excuse and sounds like victim blaming. No one should be bullied. As a teacher, it's your responsibility to make sure your students have a safe environment.
I guess you are right.
You should reconsider your job if you think children deserve to be bullied. Bullying is never okay, no matter how a person behaves. You are putting students at risk and encouraging harmful behavior by justifying it and ignoring it.