She has pernicious anaemia [ for last 6/10 years] and is on vit B12 injections every 16 weeks, Doc wont give her more often as apparently wont do her any good, she eats reasonably well. She will get up for meals but afterwards goes to sleep in chair so Dad puts her to bed. I am v concerned
It could be depression, which is treatable
It could be physical decline, which may or may not be treatable.
As long as she isn't up roaming in the middle of the night what is the harm in letting her rest on the weekends? Your willpower alone is not going to make her life longer, and forcing her to take part in activities and stay awake seems cruel. But that's just my opinion.