Charlie is Matt Oleander's ex-girlfriend.

Character History

Season 4

In Neutron Dance, when Paige Michalchuk finds Matt at the bar, Charlie approaches them. Matt introduces her as his girlfriend, and he tells Charlie that Paige is his student.
Charlie proceeds to humiliate Paige by telling Matt that she seems to be crushing on him and ordering her a Shirley Temple since it is a school night, which gets Paige and Hazel Aden kicked out of the bar.