Here are some possibilities I found:

Why I let my hair grow out /

Maryrose Wood

2007 Berkley Jam trade pbk. ed.

On a bike trip in Ireland trying to recover from a broken heart, sixteen-year-old Morgan is transformed, not only by the others on the tour, but by her visits to the past, where she is believed to be the legendary half-goddess Morganne, sent to help end a faery curse.

Rapunzel: the one with all the hair /

Wendy Mass

2005

Both Rapunzel and Prince Benjamin are trapped — in very different ways. It’s only when their paths cross that things really start to change. There are two sides to every story…

Who put that hair in my toothbrush? /

Jerry Spinelli

2004

The sibling rivalry between twelve-year-old Megin and her older brother Greg intensifies after she ruins his science project and he retaliates by throwing her favorite hockey stick into the pond.