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.
(..) All right. The king had put that rock in the road because he knew the person who dug it out, who did something, they deserved a reward. They deserved to have their life changed for the good.... forever. I invite you all to sup with us and stay till the morrow. Yeah, we need to get back home. (..)2017 TvShow: The Walking Dead Title: Rock in the Road Season: 7 Episode 9