Story highlights The girl's mother was babysitting the infant

The baby died of massive internal injuries, police say

(CNN) An 11-year-old girl in Ohio has been charged with murder after she allegedly beat a 2-month-old baby to death.

The girl, who is not being named because of her age, went before a juvenile court judge Monday and was ordered to undergo a mental competency exam before her next appearance.

"We're trying to figure out what would motivate someone to do something like that," Wickliffe Police Chief Randy Ice told reporters. "And so far, we haven't come up with an answer."

The incident took place Friday at an apartment in the city of Wickliffe, about 17 miles outside Cleveland.

The girl's mother was babysitting the infant, Zuri Whitehead. She wanted to give the baby's mother a break from caring for a newborn, police said.

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