Mother in law on blood pressure med and diazpan for sleeping.She feels depressed and no appetite.?

She also has a weird sense of smell the past 2 weeks since her bronchitis.. She was on antibiotics which could of caused the weird smell-(yeast) ? ,and I believe it is the medication (diazpan) ,that is making her depressed. My father - in - law has altzimers(sp)omg, wonder why shes depressed.This is what i believe....anyone?