If your character's in Duelling Club, they'll obviously know about it. Even if they're not, it seems like the kind of thing that spreads pretty fast, so do with it what you will.
After her crazy break, Rebecca spent the rest of Saturday night and Sunday morning in the Hospital Wing, and basically as soon as they let her out, she scaled the building. She's currently sitting on the top of the Clock Tower, and chances are she won't come down until Monday or Tuesday, including for meals/sleep.