Elsa's guardian angel

Set one year after the great thaw. For Elsa and Anna, life in the Kingdom of Arendelle couldn't be better. But when Elsa is suddenly struck down with a deadly illness, Anna is faced with the terrifying reality that her sister is dying. When someone unexpected shows up in Arendelle vowing they can help the Queen. It isn't quite the guardian angel Anna was hoping for. Elsa/Anna