Hi, thanks for writing in. Dementia and depression go hand-in-hand, so there’s a good chance that you’re right and that she does have depression.
What did she used to do with her days, before she had dementia? Often if we ask someone living with dementia, “What do you want to do?” they’ll say, “Nothing,” or, “I don’t know.” Instead, we can ask, “What did you used to do?” You may also know the answer to this! Whatever that answer is, perhaps we can fill her day with that and hobbies like it.
I always recommend asking people “for help” with chores and activities around the house. “Can you help me pick out an outfit for this event? I could really use your help on this shopping trip.” Something like that may have a better effect!