Why does kristen stewart have her hair like before i thought she cut it for the movie she is in?

She doesnt have hair like before, not yet anyway. She had long hair for Twilight, and New Moon and then cut it to film The Runaways. Now that filming for The Runaways is over her hair is still short. She is being fitted for a wig for Eclipse.

Kristen Stewart did cut her hair for her new movie in which she plays Joan Jett, but they began filming the movie right after twilight and her hair was not cut and dyed yet.

i just read an लेख today saying that she was wearing a wig to start filming.....link i dont see how else she could get her bella look after cutting it for joan jett movie....