D'awww! I sort of had the same problem when I was in first grade. See I'm a boy but back then my favorite color was, DUN DUN DUN, pink! I had a black bike that had a pink seat and handlebars (which yes was actually a boys' bike) along with pink shoelaces, but I was always made fun of because pink is a "girls' color."
Anyways after a year of teasing I grew out of it and my favorite colors became red and black, but I'm glad it worked out so much better for this youngling. May the force be with her!