Welcome to HCM
Your mother is having problem of memory for about two years. She is not able to recognize familiar faces, she forgets to eat, she is having short term memory loss
. Also her MR scan reports came normal. Most likely she is showing symptoms of Alzheimer's Dementia
. Alzheimer's disease is a form of dementia characterized by impairment in short term memory, poor judgement, cognitive decline, poor coordination some times even impairment in speech. In most of the cases with earlier stage the tests come normal. I would advise you to please take her to a good Psychiatrist
for expert evaluation. Medicines like Memantin, Donepezil
etc are very effective and halts the progression of disease.
Dr. SeIKHOO Bishnoi