This did not happen over nite her hair is black. I like to take my time and blonde people out. Yes it’s possible to do it over nite but I like to pay attention to how the hair is going to react with the #bleach.  I recommend that you do a deep conditioner at home or in the salon if you can a day or two before your blonding sessions. Keep your ends trimmed and take lots of vitamins. Dont forget to drink lots of water as well.