Whitney Houston's mother has told People magazine that she questions her skills as a parent and wonders if she could have saved her superstar daughter from the drug use that played a role in her death, Reuters reports.

"Was I a good mother?" Cissy Houston, 79, is quoted as telling the magazine in the issue due out Friday, according to an excerpt released Wednesday. "I still wonder if I could have saved her somehow. But there's no book written on how to be a parent. You do the best you can."

Whitney Houston drowned accidentally in a Beverly Hills hotel bathtub on Feb. 11, 2012, after taking cocaine and after a well-chronicled battle with drug addiction. She was 48.

Cissy Houston, a singer in her own right, talked to People about her daughter's personal life and career while promoting her upcoming memoir, "Remembering Whitney."

In the book, Cissy Houston says she was not aware of the early "partying" days of her daughter, called "Nippy" by family. "I had no idea about Nippy's 'partying.' And the truth is, back then I didn't really want to know about it," she wrote, according to excerpts released to People.

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Her daughter often didn't return her calls. "Whitney hid from me," Cissy Houston said. And when she did see her, she was afraid to confront her daughter. Shocked at Whitney Houston's skeletal appearance at the Michael Jackson tribute in 2001, she never expressed concern.

"What was the point?" she asks. "I didn't want her to run completely away from me."