Dad's passing was sudden though he's been in declining health for years. Mom hasn't left the house in several years and stopped bathing about a year ago. Short-term memory is quite bad and I'm sure she has undiagnosed dementia. Her sass and wit are firmly intact. Won't go to doctors and used to be a social butterfly. She is physically in good shape and just turned 85. She knows Dad is gone though she asks every day how he's doing, he's not coming back, is he.
She stopped leaving the house about 5 years ago to take care of Dad who had limited mobility. She is not a physical danger because she thankfully has no desire to drive or cook, and doesn't wander from the house. She snacks and nibbles throughout the day so has an appetite.