A red flag symptom of dementia is memory loss so it is very common for someone to ask questions repeatedly. Another symptom is forgetting how to perform familiar tasks requiring
one to ask how to do something they always did so well. 'Hiding' and 'hoarding' are also very common behaviors for persons with dementia. "Complaints of a Dutiful Daughter", a film by Deborah Hoffmann (1944) chronicles her mother's stages of dementia. In one scene, her mother obsessively hides and packs odd items in luggage. In her mother's mind, and perhaps in your mother's too, these items are valuable and she wants to make sure they are not lost. Many persons with dementia also forget the function of familiar items so it is possible that all these paper goods have a different meaning to her. If you google 'agnosia' you can read more about this phenomenon.