In 2288, she led a bridge simulation cadet group, acting as its captain. Gage was part of The Vanguard, a political group that believed the Federation should take a more hard line approach to hostile species, such as the Klingons and Romulans.
A young woman of impressive looks, she was seen socializing with cadet Robin Brady, a member of David Forester's bridge simulation group, noted for his shyness and lack of social skills. Soon after however, she started seeing Geoffrey Corin of the same team, something that affected Brady negatively. (TOS novel: Starfleet Academy)
She was arrested for, amongst other things, blowing up the science lab at Starfleet Academy, almost killing cadet Sturek, tampering with evidence, and trying to frame Robin Brady. (TOS video game: Starfleet Academy)