Brown, 21, was a regular user of heroin, cocaine and Xanax prior to her incident last month, sources confirm to People.
"How thin she had gotten is an indicator," one source revealed. "This girl was trying hard, but she didn't have any support system. She was still dealing with a lot of grief over her mother."
As RadarOnline.com has reported, Brown has been hospitalized since the Jan. 31 incident and is reportedly brain dead. Doctors removed her breathing tube on Feb. 17 and performed a tracheotomy, which opened a direct airway to her trachea. The procedure may prevent her from speaking ever again.
Brown reportedly began abusing drugs at age 17 and was even photographed allegedly snorting cocaine and taking hits of marijuana from a bong.
Before the tragedy, the daughter of Whitney Houston was spending upwards of $5,000 a week on drugs, a friend told The National ENQUIRER.