Teen Issues

This girl got extremely mad at me because I called her a "butt" she went on calling me a bitch and I've just been depresses lately and this made it worse. I think I just need advice on how to not care. I'm a senior in high school and I know none of this will matter in two months but it does now because I have to see her everyday in our school play. I just feel she's jealous because I got a bigger part or something