Those sources said she was also re-interviewed by police on Tuesday. Investigators are still awaiting the results of that lie detector test.
The girl's mother has hired legal counsel, Tom Kline, who represented a victim in the Jerry Sandusky trial.
Action News is no longer naming those involved in this case to protect the girl's identity.
Last Thursday, five girlfriends of the victim's father were brought into police headquarters for questioning - a day after the father was questioned. Although police have previously stated he passed a lie detector test and is not a suspect, sources say detectives confiscated his cell phone.
This comes as the reward for information leading to an arrest has jumped to $20,000. That includes $10,000 raised by the Philadelphia NAACP, Black Clergy, and other African American leaders and $10,000 posted by the Fraternal Order of Police and the Citizens Crime Commission.
The little girl was taken from her classroom at Bryant Elementary school by an unknown woman. That woman, who was caught on surveillance video, signed in and went to the girl's classroom. There, she told the substitute teacher she was the girl's mother and said she was taking her to breakfast.
When the substitute teacher challenged her, police say the woman got indignant, saying, "I signed what I was supposed to sign, I've got other appointments and I do not need to put up with your nonsense."
Investigators say after that woman left the school she walked the child several blocks to a home in West Philadelphia, where the two were joined by a man.
The girl was restrained there, police say, until another woman helped her get out of the house.
A passerby found the girl the next morning at a playground in Upper Darby. She was wearing only a t-shirt.
The woman being sought has been described as a dark-skinned black woman in her late 20s, standing 5' 5" to 5' 8" tall, with a thin build and possibly pregnant. Police say she told the child her name was Rashida.
The man being sought is described as a light-skinned, possibly white, man in his mid-thirties with short brown hair. The girl told police he was wearing sweat pants and a blue long-sleeved t-shirt.
Anyone with information is asked to call Philadelphia Police at 215-686-TIPS (8477), send a text message to PPD TIP (773847) or send a tip through phillypolice.com.