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gubblebumm's advice is good. You might also try to get the physical done by a geriatric specialist - medicine is decidedly different for the elderly.
BTW, I believe she meant "cognitive" instead of "cogenative" questions. If you're really concerned as regards her mental state, you could have her examined by a neurologist or sociologist specializing in this area. That may be the best way to settle your mind - and your mother-in-law's.