I don't think she was security. It would have been interesting if she was though. If security had a hand to hand tournament like they did in TNG, she probably would have KO', pinned, or submitted all the other security guards. Especially with guys like the ones in Dagger of the Mind, Doomsday Machine, Turnabout Intruder, Charlie X, and The Children Shall Lead. She wouldhave beaten all those guys!