The state appeals court has upheld the involuntary manslaughter conviction of a woman in the June 2003 death of a baby in a Reading day care facility.

Ann Power had challenged her conviction in the death of 3-month-old MacKenzie Corrigan of Stoneham, who died of shaken baby syndrome after being injured in the day care facility Power ran in her home.

Power was convicted in 2006 of involuntary manslaughter by reasonof wanton or reckless conduct and received a three-to-five-year sentence. She also pleaded guilty to operating a family day care home without a license.

The Massachusetts Appeals Court rejected her appeal in a 16-page opinion written by Judge Mitchell J. Sikora.