It is implied that she was only doing so because she wanted to make Shōma jealous or show a reaction. She was "bullying" Fumino when she first arrived, but eventually became friends with her. She gives Fumino a makeover for a date with Kazuma At the end of chapter 19, she told Shōma that she would be leaving for America to marry someone that her father chose for her, but she didn't want that because she was really in love with him (Shōma).