Or Maybe. She was born with it. Because. Inside her dad's head. Anger is in charge. And Fear is his number 2. And inside her mom's head. Sadness is in charge. And i think joy seem to be her number 2. Or a reserve for riley. Thats why inside riley's head has two male, and 3 female emotions. Make sense. And she has imaginary boyfriend. So she cannot be bisexual.