A northern Michigan woman accused of trying to kill her autistic daughter has pleaded guilty to first-degree child abuse.

Benzie County Chief Assistant Prosecutor Jennifer Tang-Anderson says Kelli Stapleton entered the plea Tuesday morning. Stapleton had been scheduled to go on trial Wednesday on a charge of attempted murder.

Tang-Anderson says no sentencing date was set. The maximum punishment for the charge is life in prison.

The 46-year-old Stapleton is accused of trying to kill herself and her teenage daughter last year by carbon monoxide poisoning by igniting charcoal grills inside a van.

Isabelle was 14 at the time. She has severe autism and sometimes has violent outbursts.

Stapleton's blog had chronicled the challenges her family faced while caring for her.