Hello,
Welcome to the ehealthforum. Stroke can effect any part of brain and if she has weird dreams then maybe the part of the brain causing dreams and the limbic system has been effected by the stroke attack. It can also be due to post traumatic stress disorder(PTSD).
PTSD is a complex condition that can be associated with significant illness, morbidity, disability, and impairment of life functions. The symptoms of PTSD may resemble other psychiatric conditions.
So please consult a psychiatrist to rule out other possibilities. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care.