>>11175633From behind, at a distance, out of focus (the camera pans past her to look at a bridge that she's about to steal a beam from), and for less than a second. That tiny glimpse was only included be wise the guys who made her model were upset that the robot mode they came up with wasn't going to be seen - she's in bird mode for the remaining 21 minutes and 53 seconds of the 21:54 episode, and acts more like an animal with a three-word vocabulary than an intelligent alien robot. Her appearance in a short story that takes place afterwards also has her in bird mode the whole time (and still thinking/acting more animal-like than sentient). She's a character who may as well not have a robot mode - she seems to believe she's an actual magpie, right down to her nesting behavior.
The other three Corvicons that showed up later were a different story, though.