Whitney Houston's mother Cissy opens up about her heartache watching her late daughter's drug addiction devour her alive, in her new book, Remembering Whitney.

"She started partying, and she didn't really know how to stop," Cissy, 79, wrote of the Grammy-winner. "I want people to know the truth about her, how she really was."

Bobby Brown mistreated Whitney and was "no help to her at all" in her battles with drugs, Cissy writes in the tome, but says that she doesn't "blame him for her drug problems."

"I used to wonder what she was doing at night, where she was … Whitney hid from me," Cissy wrote, adding her calls to her daughter often went unreturned.

Cissy said she wonders if she could have "saved her somehow," but admits the addiction grew so out-of-control, she didn't mention it out of fears Whitney would "run completely away" from her.

"What was the point?" she wrote.

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