Need advice: A girl with the same name as me won’t call me by my name because she doesn’t like sharing and now we’re fighting. What do I do?

Need advice: A girl with the same name as me won't call me by my name because she doesn't like sharing and now we're fighting. What do I do?
Need advice: A girl with the same name as me won’t call me by my name because she doesn’t like sharing and now we’re fighting. What do I do?
Schedule a duel: winner gets rights to the name [drawing of person holding a thumbs up]
Schedule a duel: winner gets rights to the name [drawing of person holding a thumbs up]

Would you fight with a three year old?  This person is acting like a toddler.  Think of yourself as a preschool teacher, and ignore this behavior.