Elsa dies in Ahtohallan "FROZEN 2 "(The Truth)

Elsa goes in Ahtohallan to learn of the truth about the past. At first, she experiences the good memories.
When Elsa finally learns the truth about King Runeard, it seems she had gone too far in her quest and ignored her mother's warning about going too far. And so, in her last moments before death, she uses her powers to inform Anna of the truth.