Casey Anthony's mother Cindy offered a new explanation for her daughter's history of erratic behavior in an interview on 'Dr. Phil' (weekdays, syndicated on CBS). She acknowledged that Casey's behavior indicated instability, and said she thought it might have had something to do with the seizures Casey suffered, both before and after her arrest.

Defending her daughter, Cindy said Casey "was an awesome mother." Dr. Phil McGraw disagreed. "Other than the fact that she wasn't providing for her daughter," he said, "she was manufacturing friends, playmates, playdates, nannies, all of those sort of things, which to me, is highly unstable behavior."

Cindy pointed to Casey's seizure in November of 2007 as a possible cause. In answer to Dr. Phil's question, Cindy said that her daughter had been medically evaluated but the tests had turned up nothing. "They kept her in the hospital for three days and worked her up and didn't find anything," she said.

When Dr. Phil reinforced the point that the doctors hadn't found anything wrong, Cindy pointed to Casey's second seizure. "Again, she had that second one when she was home after she had been arrested, when she was out on bail for the first time," she said.

No one had offered this explanation until Cindy Anthony's interview with Dr. Phil, though it was not made entirely clear how the seizure related to Casey's behavior. It merely adds another layer to the tragic mystery.