So my "friend", the one who said our friendship was over, is spreading rumors about me. What should I do?

How is she gonna get mad when she called it quits talk about dumb smh but anyways i wouldnt even stoop down to her level and try to get even. Live your life make new friends and just ignore her cause she may be book smart but well thats about it. lol. and you messed up by even talking to that girl. but um she just mad and she doing all this to make herself feel better about the friendship ending . so childish.