Kamiyah Mobley was snatched from her mother just eight hours after she was born by a woman posing as a nurse.
She has been raised her whole life as Alexis Manigo until police arrested Gloria Williams and charged her with kidnapping.
Police have suggested Manigo, now aged 18, had 'an inclination' about her past before the dramatic events of last week.
Now friend Arika Williams has said the truth may have come to light as long as two years ago when Manigo got a job at a restaurant and needed her birth certificate.
"Lexy didn’t have that so she asked Miss Gloria for it and Miss Gloria kept brushing it off."
"Lexy kept being hard on her mother, like ‘Momma, where is my stuff? I want to get this job.’ Then Miss Gloria just broke down and told her this is why right here, you can’t do this. I kidnapped you.
"She was upset about it,” Arika added.
"She even stayed home from school the next day."
Police in Jacksonville, Florida, where Williams was arrested say they are not sure exactly what Manigo knew and when.
Manigo's father has said she is full of mixed emotions after being reunited with her biological family.
Shanara Mobley and Craig Aiken could not contain their elation during the “beautiful” reunion with Kamiyah Mobley.
Craig said: “It was the best day of my life... We are so happy. I hope the world is rejoicing with us.”
The trio were together for 45 minutes at a US police station.
Kamiyah and her real parents posed for a series of touching photos in which Shanara appeared close to tears.
Craig, 41, said they did not discuss the abduction during the meeting behind closed doors, instead concentrating on getting to know the daughter they feared was lost for ever.
The dad said: “We laughed, we chatted, we didn’t allow any negative thoughts.
“We didn’t talk about the kidnapping. It’s going to be hard for her to turn this into a positive.
“She’s got very mixed emotions about the woman who raised her.
“But we are going to be there for her, this is just the start of a wonderful future.”
He added: “First meeting was beautiful, it was wonderful, couldn’t went no better... she was glad to meet us.