Queen Elsa of Arendelle is the older sister of Princess Anna and was next in line for Arendelle's throne, until her powers over ice and snow led her to become the famous Snow Queen, ruler of winter.

Elsa's Story (Frozen)
Queen Elsa of Arendelle is the older sister of Princess Anna and was next in line for Arendelle's throne, until her powers over ice and snow led her to become the famous Snow Queen, ruler of winter.