I need help coming up with a nickname for a character in my story.?

Well the character is a girl, her actual name is Ally. She is hyper, always humming or singing, skips a lot, not school like skipping instead of walking, and dresses goth but isn't to an extent, blond hair with purple highlights. Now she isn't the main character, but her best friend. The nickname is from a boy, but they aren't together just friends in sum kinda way.. See, she's so complex i cant think of one.. any ideas??