A stroke, also known as a cerebrovascular disease, is the necrosis of brain tissue because of ischemia led by variety of factors such as atherosclerosis or long standing hypertension. In this patient, the Wernike's area is most probably damaged as her language understanding is not intact. This is termed as receptive aphasia.
If Broca's area is damaged, then the patient will understand language but will not be able produce language. This is termed as expressive aphasia.