What do you think (guys and girls)?
Most Helpful Guy
I say... try it out! That's the nice thing about hair... you can always change it back. :)
Now... be careful though! Since her hair is already dyed black, it could be damaged when trying to remove the color. The final color (after the re-dye) might look good, but the hair could end up being a mess from being "fried" during the bleaching process. Take some good precautions and use some really good conditioners after the fact and you should be okay.
Good luck and tell your friend to keep her chin up!