Orange County sheriff's deputies apparently found no trace of Caylee Anthony, WKMG-TV, Orlando, reported. Another area was searched Monday.
Casey Anthony, the missing toddler's mother, remains jailed on $500,000 bail. An appeals court refused Monday to reduce her bail.
Caylee's family reported her missing in July. Casey was arrested soon after on charges of neglect, making false statements and obstructing an investigation.
Casey Anthony and her daughter had been staying with her parents, George and Cindy Anthony. Cindy Anthony told WKMG that she and her husband have been getting threatening telephone calls.