Carla was in The Secret Route, she was the girl who took Lancer in following the ill-fated attempt by Mars Division to liberate the Earth.
http://robotech.wikia.com/wiki/Carla
http://www.robotech.com/infopedia/episodes/viewepisode.php?episode=71
It was the episode where Annie briefly leaves the team to go with a family who had a map that they bought which supposedly told of a secret route that would lead them safely away from the Invid.
Those links helped. It’s been more years than I like to think since I’ve seen Robotech.
Carla would have probably been a dead end character.
Rook had way more going.