Suggest Treatment For Low Energy And Excessive Sleepiness

I am asking on behalf of my mother in law. She is 96 years of age. She sleeps a lot and has little energy. She has often mentioned that the back of her head feels funny . She has suffered with chronic depression most of her life and is taking low dose of sertraline daily. She had a twin who also suffered from depression and also had narcolepsy. He died many years ago of some kind on cancer. We are at our wits end trying to come up with what might be her problem(s). Any suggestions might prove helpful. She is scheduled to see her physician within the next two weeks. It would have been nice to know up front that this service required a fee. Since it needs a payment I am NOT interested in what the doctor has to say. We will consult more thoroughly with her personal physician at her upcoming appointment. So, please disregard this question.