Published: Oct 06, 2011 3:45 PM EDT

ORLANDO, Fla. (AP) - The estranged daughter of actor Billy Bob Thornton has been sentenced to 20 years in prison for the death of a friend's 1-year-old daughter during an overnight stay at her home.
    
Amanda Brumfield was sentenced Thursday, four months after she was convicted of aggravated manslaughter of a child. She was acquitted of first-degree murder and aggravated child abuse charges.
    
Brumfield claimed that Olivia Madison Garcia hit her head after falling while trying to climb out of a playpen.
    
Prosecutors said it was "impossible" that a fall from that height would cause a three-and-a-half inch fracture on the girl's skull.

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