Melissa Bailey, 29, was arrested in 2009 and charged with two counts of sexual battery on a person under the age of twelve, lewd and lascivious molestation, lewd and lascivious exhibition, possession of child pornography and use of child in sexual performance.
Charlotte County deputies said it was one of the worst cases they have ever investigated.
Detectives say Bailey let her boyfriend, 62-year-old Glenn Nelson, rape her 18-month-old daughter.
“They’d been having sex with this baby, both of them, since the child was born,” said Bob Carpenter of the Charlotte County Sheriff’s Office at the time of their arrest.
Bailey’s attorney says they will use insanity as a defense. A doctor has already ruled her competent to stand trial.
Bailey rejected a plea deal from the state. If convicted she could face up to life in prison.
Nelson agreed to a plea deal last year and is in prison.
In an earlier interview with NBC2, Nelson denied raping the baby, but admitted to talking to Bailey about it.
“It’s all in there all the time about fantasies- not reality that was happening. It was fantasizing and talking about it,” said Nelson.
The victim, who is now four years old, is living with her father according to the department of children and families.
The trial is expected to last through Thursday or Friday.