Nelly's hair

Nelly asked if she could have her hair dyed. I couldn't think of a good reason why not - I used to do mine. "What colour?", "Blue". So I agreed, if she will dye it back to brown for school, I have no objections.
So yesterday we bought the home dye kit - first to blonde, then blue - how hard can it be?

Oh my ......<insert appropriate swear words of choice>.
She is, at the moment, upstairs drying her waist length wavy hair after I, her loving mother, just made the biggest hash of dying her hair blonde.
I feel sick, my stomach is churning, WHAT HAVE I DONE to my baby?

and she STILL wants me to dye it blue.

Addendum...

Panic over. Now she wants it blue.

It's much more subtle than I expected - I like it and so does she - which is the main thing.