My 94 Year Old Mother Has A Poor Memory And

My 94 year old mother has a poor memory and gets confused but who is generally of ok health, not obese, never smoked, or drank, exercised into her eighties, has had some mini strokes in the past is now reporting that from time to time, and more often recently, she has been getting dizzy and falling. It frightens her more than hurts. As addition info, only today was she released from the hospital after an over night stay due to diarrhea. All her tests were normal including blood, urine, cat scan of chest blood pressure etc., etc.,, should I just reassure her it comes with age? Get her a walker???