#ffic ideas

What if when the sisters grow old and when Elsa dies Anna gets dementia and when she goes to the study room but sees the books neatly placed but Elsa isn’t there as usual, writing. She then goes to Elsa’s room to knock in that door asking to build snowmen? Or she walks around the castle looking for Elsa or Olaf but can’t find anyone? And she does this every single day because she keeps forgetting her sister is dead.