A Trempealeau County woman charged with killing a toddler in her care by giving the girl a combination of the prescription painkiller Oxycodone and the antihistamine Benadryl was convicted this week of homicide.

Amanda Butts of Osseo, Wis., pleaded guilty in Trempealeau County Circuit Court to first-degree reckless homicide and no contest to physical abuse of a child in the June 2013 death of 22-month-old Alexis Behlke, her boyfriend’s daughter.

Butts, 23, initially denied giving the girl anything but children’s Tylenol after bringing the girl to an Osseo hospital where she was pronounced dead early June 22. According to the complaint, the girl had bruises and cuts on her face and forehead.

Butts, who cared for the girl while her boyfriend was at work, told police she had been whiny all day and wouldn’t sleep. She said the bruises were caused when she attempted to remove a piece of peanut butter sandwich from her mouth.

The Dane County medical examiner later determined Behlke died from the combined effects of oxycodone and the antihistamine diphenydramine as well as amitriptyline, an antidepressant, according to the complaint.

An autopsy also revealed fractures in the girl’s left wrist as well as blood in her ear canals, which together are “consistent with assaultive, inflicted injury.”

Behlke’s siblings told investigators they saw Butts throw her to the floor and push a pill down her throat and that they saw their sister throw up, according to the complaint.

Butts later admitted to investigators that she gave the girl one of her prescription oxycodone pills, though she denied giving her Benadryl or amitriptyline. Butts said she put Behlke in the bathtub and ran cold water in an attempt to revive her and that the bruises on her face were a result of CPR efforts.

A sentencing date has not been set.