A positive attitude causes a chain reaction of positive thoughts, events and outcomes. It is a catalyst and it sparks extraordinary results.
Being sad and being depressed are two different things. Also, people going through depression don't look so, while someone sad will look sad. The most common reaction is, 'How can you be depressed? You have everything going for you. You are the supposed number one heroine and have a plush home, car, movies... What else do you want?'