She is having ischemic brain disease. The risk factors at this age for brain ischemia should be looked for . Her BP is normal as mentioned. Investigate for
diabetes , for hyperlipidemia (blood cholesterol level ). Cardiac evaluation . If she has any addiction like smoking or tobacco it must be stopped. Her behavioral symptoms may be because of brain disease or a separate entity, however she is rightly prescribed. Continue same treatment as advise and take care of other factors as mentioned above