That's the question that could solve everything.Although, I do believe that Monica and Vic were truly close friends in the past... I am still trying to find the turning point. What was the final straw that caused her to snap? Was it really after hearing about Vic's promotion and that he was moving back to Texas? Or is there something more?
When did Vic have that conversation? Who did he talk to?
Whoever he talked to must have told someone in the clique (probably in an innocuous, casual conversation) and then the rest of the clique was informed, pouring gasoline on an already volatile situation (they already didn't like the fact voicing Broly in the new Dragon Ball film would put him in high in demand at the convention scene, possibly rejuvenating his VA career as well, but now Vic will be in a position of authority? That won't do!).