Deborah Bradley was seen on surveillance tape buying wine. She admitted she may have blacked out and actually saw the child hours before the time she originally told police she checked on her.
But she insists she did not harm Lisa.
The couple reported their baby missing on Oct. 4. Investigators brought in a backhoe and dogs to search a creek bed near her home on Monday, but so far have found nothing.
Police have not named any suspects, but Bradley said they accused her of killing the girl.
A New York attorney known for defending Joran Van der Sloot, the suspect in Natalee Holloway's disappearance, has been hired to represent Lisa's parents. Joe Tacopina said it was natural for police to focus on the parents.
"The police have to start with the mother and father, they absolutely have to," he said. "They're the first people they should look at. But don't come to a conclusion because there's no other answers."
Tacopina refused to say who was paying him, only saying he had been hired to counsel the couple through the investigation. He insisted they "have nothing to hide."
"I don't recall in recent history anyone under this umbrella of suspicion be so open and forthright, warts and all, regarding the events," Tacopina said.
The Associated Press contributed to this report.