Mom is in a skilled nursing facility following hip surgery. She is doing great physically but her cognitive abilities have been declining (they had been declining even before surgery). She told me today that when she thinks of home its the house she grew up in another town. She said she can't picture her current house that she's lived in for 60 years. She knows the street name but has no memory of the house. She said it concerns her that she can't remember because she knows she should. Is this normal?