My daughter had medium blonde hair and dyed it a dark brown, how do I get the dark color out

Hi there!
I feel your pain... I deal with this in the salon all the time & did it to myself at the age of eighteen! The only person that can fix this is a professional hairdresser. Tell them you don't want a "color correction", (which I myself charge by the hour) but you want a HEAVY blonde weave done. This will cut-down tremendously on the cost. It might take more than 1 visit to have her hair back to blonde, but she won't have to cut all her hair off and it's more cost effective. Also, tell the hairdresser to use a high-lift blonde color along with bleach. The high-lift blonde won't get as light as the bleach but it is better on the hair and the more tones in there the better!
Hope this helps... good luck to you!
Ericka