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Of course dementia isn't the only cause of delusions. I think a medical evaluation would be helpful as a starting point.
Generally, it is not productive to try to argue or reason someone out of a delusion, whatever the cause. Try to acknowledge their feelings and be reassuring. "Your lovely paisley scarf has gone missing? Oh, that is a shame -- I know it is one of your favorites. Just in case it got misplaced I'm going to help you look for it. If it doesn't show up within a week, lets go shopping online and try to find a similar scarf to buy."
People with Alzheimer's frequently accuse others of stealing from them when really they're hiding their belongings (so people won't steal them) and then can't find them.
Otherwise, a bit more about her history would help. Is she living independently?