LEESBURG, Fla. -- A gas credit card is the latest clue in the case of missing 2-year-old Trenton Duckett. Monday, investigators revealed Melinda Duckett bought gas at a BP station on U.S. Highway 27 in south Leesburg the day before Trenton was reported missing.

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VIDEO: Search For Missing Toddler May Expand

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The revelation means one more hour of Melinda Duckett's timeline has been filled in, but police don't know if Trenton was with her there, because she paid at the pump and there are no surveillance cameras outside.

From a piece of Melinda Duckett's old mail, investigators discovered she bought gas at the BP on Saturday, August 26 at 5:25pm, just about an hour after her last confirmed sighting when she left her grandparents' house.

"It forces us to consider she didn't go north to the Ocala forest area," said Capt. Steve Rockefeller, Leesburg Police Department.

The credit card purchase plugs in an hour in the 15-and-half-hour gap where detectives don't know where Melinda was the day before Trenton was reported missing.

After Melinda committed suicide about three weeks ago, investigators focused much of their attention on Melinda going to the Ocala National Forest from her grandparents' home in Lady Lake.

Police said Melinda drew a map for her attorney, showing that's where she went. But if she was at the gas station in south Leesburg, police now think she could have traveled south before going north.

"And now going south, that kinda opens up a whole new area," Rockefeller said.

That means the search for the missing 2-year-old could expand to even more wooded areas.

"South Lake County is a very rural area. We have lots of different lakes and woods in that area and it's definitely an area we didn't' know she was at previously," Rockefeller said.

Leesburg police said next detectives will try to recalculate possible routes Melinda could have taken before going to the Ocala National Forest.