Linda Lee Robot
From superman.nu: Supermanica
Linda Lee Robot
A robot duplicate of Linda Lee, the orphan who is secretly Supergirl. Built by Superman, the Linda Lee Robot is an exact duplicate of Linda Lee.
The robot resides in a hollowed-out tree near the Midvale Orphanage. Programmed to respond to the commands of Supergirl, the robot is capable of taking the real Linda Lee's place for extended periods while Supergirl is away from the Orphanage on missions.
(see Superman Robots)