ORANGE COUNTY, Fla. -- The mother of a missing 2-year-old girl remained in the Orange County jail Wednesday evening on a $500,000 bond that her parents are desperately trying to find a way to post.

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There was also word of a new lead Wednesday from a family claiming to have seen Caylee at Orlando International Airport getting on flight going to Atlanta with middle-aged woman earlier this month. Investigators are working to develop a sketch to release and said they are investigating the lead. Other leads they've received, including some from out of state, have not turned up anything.

Casey Anthony's daughter Caylee has been missing for weeks and her family is trying to come up with the money to set the child's mother free. Eyewitness News learned Wednesday that there are four holds on Anthony before she's released. Two are related to the judge's requirements and two are undisclosed, but the jail won't explain why they aren't being disclosed. Immigration issues, a warrant for another charge or a mental health evaluation are sometimes the reasons for an undisclosed holds.

Casey's parents are trying to make bond, which requires $50,000 in cash and $450,000 in assets, something they said they don't have. However, a bondsman could take the risk by not requiring that the family provide the full amount in assets.

Casey Anthony's attorney said the bond should have been $10,000 dollars, because she has no criminal history. The judge said, because of Anthony's strange behavior and lack of cooperation since her daughter disappeared, the high bond was warranted.

George and Cindy Anthony said they are doing what they can to gather the money together and spent hours late Tuesday in their attorney's office making a plan to get their daughter Casey out of jail.

"We're doing everything we can to get her out. We're working on it. That's why we can't talk right now," said Jose Baez, the family's attorney.

If Casey Anthony is released from jail, she will have to wear a GPS device, and there may be other ways to get information from her. There is precedent in Florida to bug her house.

In the Tampa area in 1997, detectives bugged a house belonging to Steven and Marlene Aisenberg after their baby daughter Sabrina disappeared. The parents were caught saying their baby was "dead and buried," but they were never convicted of a crime.