True, she got the age and kid thing wrong, but maybe she meant to. Maybe she made up Zanny the Nanny for her mother. Maybe she heard of ZG through one of her friends, particularly WW, since she was quoted as hanging out at Houlihan's. This guy claims to be the owner of said restaurant on his Myspace page. Maybe KC wanted her family and friends to believe that her daughter was being kept by someone. She overheard the name, and then used it. Maybe after she was caught by police she felt bad that the real ZG would be implicated in the disappearance of her daughter. Not to mention, she knew that this woman would deny knowing her since she probably never knew her. Who knows why she said what she said? KC is a liar, and that has been established.
I have been dying to know where she got the name Zenaida Fernandez-Gonzalez. I think it is too much of a coincidence that she placed ZG at Sawgrass the day before the real ZG was there.
Side note: does anyone know if this is the same Laura that is friends with RM??