Many things have been happening to validate this suspicion.
Just last week she said Mama and Dada. She learned how to say Mama first for the record :) The crazy thing is we didn't even try to teach her...she just said it. She also says Mama specifically to me now when she wants me to pick her up, or wants food. She also started sitting up unassisted at 5 1/2 months, and the doctor said this this was unusual given her age.
Who knows what's next, advanced mathematics? physics? esp? the infant spelling bee?