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.
(..) You're heading into the best years of your life. That's right. You put in the work. You climbed the mountain. Now it's time to reap the rewards. I guess you're right. Sounds pretty good to me. You know, the more I look at you, the angrier I get that you don't got a beard. (..)2012 TvShow: Modern Family Title: Bringing Up Baby Season: 4 Episode 1