Happiness and success are two different things
If you observe and listen, you will see there are people who earn respectable amount, but they will tell you that they are very tired and even depressed. Then you also see people living gentle, optimistic, always smiling, whether they're in a rented house, having a job is very normal. You can not deny that these people are not happy, though you will not see their careers as successful.
"What will make her happy?" and "What will make me successful?" are two of the most important questions you can ask yourself. But remember, there are two different questions