Sleeper
"Sleeper" is a term used by members of Fembot Central to describe a gynoid that does not realise she is one. These are frequently depicted in stories often as a plot twist.
This situation is not to be confused with gynoids such as Call from Alien: Resurrection, who are aware of their true nature though it may not be revealed to the viewer/reader or other characters.
Examples in Fiction
Wendy from The Outer Limits episode "Glitch."