MARTINEZ, Calif. (Reuters) - A California woman whose 13-year-old daughter weighed 680 pounds (308 kg) when she died of congestive heart failure in 1996 was found guilty Friday of misdemeanour child abuse. Marlene Corrigan had faced felony misconduct charges in connection with the death of her daughter Christina. But a California judge found Corrigan guilty of the less severe misdemeanour offence on the grounds that passive rather than active misconduct helped trigger Christina`s death. Christina died on November 19, 1996, at her home in El Cerrito, about 20 miles (32 kms) northeast of San Francisco. Authorities found the girl`s body dotted with bedsores and lying amid faeces, urine and empty food containers. A medical examiner concluded Christina died of congestive heart failure due to "morbid obesity," and Contra Costa County prosecutors later charged Corrigan with child abuse. Corrigan could have faced six years in prison if convicted of the felony child abuse charge, but Judge Richard Arnason`s ruling means she will face at most a year in jail and will have to perform community service. Corrigan`s sentencing hearing was scheduled for February 27.