Hair colour disaster!!!

[Crispsheets]

DD went to hairdresser's today and it's awful.
She has mousey hair which had some highlights. She wanted balyage .....Has come out with three inches of dark hair from scalp and then bleached blonde .
Now the blonde isn't too bad...It's the darkness which looks terrible.
I'm prepared to pay to get it sorted at my hairdresser's...Can the darkness be lifted to her normal colour?
Or can the whole lot be taken back to a more natural colour?