Amanda Brumfield, 33, was found guilty of aggravated manslaughter of a child in May.
The charge stemmed from the death of a 1-year-old girl she was babysitting in 2008.
Brumfield has said the fatal head injuries the child sustained were the result of an accident.
The Orlando (Fla.) Sentinel said Brumfield was scheduled to be sentenced Thursday but the judge delayed ruling on her defense team's motion for a retrial so he could review previous court transcripts.
A date has not yet been set for the ruling, the newspaper said.
Thornton's film credits include "Sling Blade," "Armageddon" and "Pushing Tin."