Queen Moon and King River's Eldest daughter Solstice Butterfly was a student at St. Olga's school for wayward princesses. She was always a rebel who never did what she was told. She was regularly referred to as the "bad influence". So when someone else finnaly gets referred to as the bad influence you could say that she was interested. Star Butterfly had been begging her parents for months to let her elder sister out of "princess jail". But when it benefits the Kingdom of Mewni, they finnaly cave. After bringing Solstice home they decided they needed a new way for her to live. So they brought her to earth.