hair color

Hi, Photoshop Gurus! I'm useless with photo-editing and I hope someone is willing to help me out. I was supposed to dye my hair purple to lighten the news (for Facebook friends) that I am having brain surgery soon, but the date is sooner than I expected and I can't dye it without jeopardizing...

I recently did a photoshoot with my friend. She has blonde hair but to go along with the theme of the photo, I really want to change her hair color to a white-silvery color. I've been on photoshop for 3 hours now trying to change it but no matter how many different things I've tried it always...