Get a MRI Brain scan and detailed neuropsychological assessment done to see if its Dementia, Aphasia or something else. Consult an astute psychiatrist to get th needed done.

Seems like its early start od dementia but need to evaluate in detail as dementia caused by multiple factors. It can be pseudodementia too consult psychiatrist for confirm diagnosis and treatment as early diagnosis and treatment can make her life easy.

Hi

See for any suggestions to be given the doctors need to get more history such as Age of the patient, onset duration and whether fluctuations of symptoms are there. Without seeing the patient and examining we can’t just advise any tablets. Please take her to a psychiatrist

As the information provided it seems she has early stage of dementia, reason for dementia is multufactorial ranging for Vitamin deficiencies B1, B12, D3 ( thiamine in some cases if there’s H/O heavy alcohol ), endocrinological to metabolic to vascular to genetic like Alzheimer’s

According to the history that you have provided it seems she may be having  mild cognitive impairment (MCI) But with only this much we won't be able to confirm the diagnosis. And there are many causes of MCI. We would even have to rule out whether the dysfunction is so much to be called dementia or not. For all these she needs to be assessed in detail. Even to tell whether there is thiamine deficiency or not we would have to do blood test. If there is no deficiency and you give thiamine her condition will not improve. Hence take her to some clinic or hospital and get her assessed by a psychiatrist or neurologist.