(written from a Production point of view)
Andrea Lockhart is the actress who portrayed the Orion ISS Avenger crewmember in the Star Trek: Enterprise episode "In a Mirror, Darkly, Part II". As a background actress she received no credit for her appearance. 
Lockhart studied acting at the American Academy of Dramatic Arts in New York and at The Young Actor's Space in Los Angeles, California. She appeared in various stage plays such as "Hedda Gabbler", "Picasso at the Lapin Agile", and "Departures", and received a LA Weekly Theater Awards nomination as best actress in 2008.
Beside the two television pilots Anonymous and Man Out of Box, Lockhart appeared in the thriller Darkroom (2008) and the drama Frozen Kiss (2008, with Karen Landry).