THE body of Lisa Jordan, pulled from Guide reservoir on Sunday, had been in the water for several weeks.
Identification has only been possible because of the clothing she was wearing when she went missing from the psychiatric unit at Queen's Park Hospital.
Opening an inquest into the death of Miss Jordan, 23, whose last address was the YWCA on East Park Road, Blackburn, coroner Andre Rebello said he had asked that the matter be reported to the Mental Health Act Commission.
He said Miss Jordan had gone missing from the psychiatric unit a few days after being admitted under Section 2 of the Mental Health Act.
Earlier, during the search for Lisa, her parents, Tom and Mary Jordan, of Blackburn Road, Accrington, issued an emotional plea through the Lancashire Evening Telegraph begging their daughter to come home for Christmas.
Police also circulated her description in the West Midlands after she was believed to have phoned a friend in Blackpool from a Birmingham phone box on Christmas Eve.
But the Home Office pathologist carrying out a post mortem examination has reported to the coroner that the body had been in the water for "several weeks."
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