Michael Jackson's mother was unaware she had been reported missing during a stay in Arizona last month, according to court documents.
Katherine's 10-day absence at a luxury resort in Arizona came as a power struggle erupted within the large Jackson clan over control of the pop star's estate.
The 82-year-old returned to the family compound near Los Angeles last week after publicly denying rumours she had been kidnapped by some of her adult children.
But in a declaration submitted to the court on Thursday, she said an iPad was taken away from her, her room telephone was not working and her television had sound, but no picture.
Had she known her grandchildren were trying to contact her she would not have been gone so long, she added.
Katherine will share custody with Jackson's nephew TJ. "At the time, I trusted the people I was with to be honest with me," she wrote, without specifying to whom she was referring.
She said she had planned last month to take a road trip to New Mexico to watch four of her sons in concert.
But instead an unnamed doctor ordered her to rest, told her to take a plane, and she found herself at the Arizona resort and spa.
After repeatedly asking for the television to be fixed, she woke up one morning to hear a broadcast that she had been reported missing, she said.
During her absence, five of Michael Jackson's siblings wrote to the executors of their brother's estate challenging the validity of the will found after his 2009 death.
Jackson's estate has earned £306m in profits since his death. The will left control of the estate with two non-family executors for the benefit of the late singer's mother and his children.
According to recent court documents, the estate has earned £306m in gross profits since Jackson's death and much of his estimated £322m debts have been paid off.
Jermaine Jackson has called for an end to the bitter public fight, which saw an angry standoff last week between his pop star sister Janet Jackson and her niece Paris at the family compound near Los Angeles.
Katherine has agreed to share guardianship of Prince, 15, Paris, 14 and Blanket, 10, with TJ Jackson, the 34-year-old son of Michael's brother Tito.
Los Angeles Superior Court judge Mitchell Beckloff will hold a further hearing on August 22 to consider making the shared guardianship arrangement permanent.
Michael Jackson died in June 2009, aged 50, from an overdose of the surgical anaesthetic propofol. His personal physician is serving four years in jail for administering the dose as a sleeping aid.
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- July 28: Jackson Custody Deal
- July 23: Jackson's Mother Reported Missing
