Well according to her father, YES! she did. In an interview on a US chat show her father commented:
"Everything Amy did, she did to excess. She drank to excess and did detox to excess."
Amy who sadly died on July the 23rd had no drugs found in her system, according to toxicology reports however it was recorded that alcohol was present in her body. I understand that it must be hard for her father to accept that but she obviously was not detoxing, maybe she detoxed from drugs that she previously took but we must not forget that alcohol is also a drug. No matter what anybody thinks or says, it is a substance that changes your emotions and your health and should not be put to the side. It is sad to see such an amazing talent go to waste but her music will never be forgotten.