Since she's Tojiko...
"To shut oneself in" in Japanese is TOJIKOmu. I can't think of a good pun, feel free to change it.Oh, crown prince! What's wrong?Ah... Well... Yesterday I got home late.And I got into a fight with Tojiko.I see! So that huge thunder was her!I apologized right away.But her mood didn't improve.Ever since the fight, she's shut herself in her room.WorriedTroubledPun