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.
(..) so you can see the conundrum. The Tullys are rebels because they're fighting for their home? Riverrun was granted to the Freys by royal decree. As a reward for betraying Robb Stark and slaughtering his family. Exactly. We shouldn't argue about politics. You're a knight, Ser Jaime. (..)2016 TvShow: Game of Thrones Title: No One Season: 6 Episode 8