"Well, it is possible, but really, really improbable if she saw her friend just the day before. The pros said you can strip and bleach the color out of hair, but the natural pigment leaves a faint tint almost always, unless you do it through several processes, and even so it weakens the hair each time. We could probably take a look at the quality of her hair, see if it breaks easily... but she'd be one in a million to get it that pure white in a single process."