Document everything.
Good you told the Principal.
Follow up if he does not.
In Hawaii, there are so many different ethnic mixes. And it is really great.
Korean and Caucasian kids or other mixed kids are common here in Hawaii.
So we don't get as much racial taunting here, but there are still Bullying. My daughter was bullied even in 1st grade.
Now, if at any time, your daughter feels unsafe or threatened, you need to make sure she knows what to do. ie: tell someone right away, her Teacher/the Principal/any adult at school, and don't be by herself... keep her friends around her. For safety etc.
And YOU as the parent, NEED to step in and do something about it, too. With the school.
ABC news, had a show on Bullying a couple of years ago.
One girl, was even followed home. And then beat up outside her home. She ended up in the hospital. Beat up by 2 other girls. Why? The Bullies said it was because she was "pretty."
It is, absurd.
You need to make sure, your daughter is telling you, about anything that is happening to her. Because, if the Bullying ever gets out of hand, you need to know.