Her success is 'just reward for' her hard work. [=she deserves her success because of her hard work]
She is 'reaping the rewards' of success. [=is getting all the good things that come with success]
The police are offering a 'reward for' information leading to the capture of the fugitive.
(..) Since l was three, my lord. Charming. l think we ought to get to know each other better, Daphne. Better, my lord? l can reward you well. My lord.... Daphne.... My lord! Daphne.... My lord forgets himself! (..)1973 Westworld