Cherry's Freedom

 is an unmarked Fallout 3 quest.

If you talk to Cherry, one of Dukov's escorts at Dukov's Place, she will ask you to escort her to Rivet City. You can just leave Dukov's and use fast travel to take her directly there. The reward is a Karma boost. Also, you will be able to find Cherry wandering around Rivet City after the quest.

This quest is automatically aborted after 5 game-days. You may take her to a house, in either Megaton or Tenpenny Tower, and leave her there for five days. Upon which the next time you visit she will tell you that your place wasn't part of the plan and she is going back to Dukov's. You cannot restart this quest ever after.

You can use this escort as incentive for her to steal Dukov's key for You Gotta Shoot 'Em in the Head.

Bugs

 * After successfully passing the speeck check to get her to agree to steal Dukov's key and relocate to Rivet City, Cherry's scripted lines -- "Okay. Rivet City has got to be better than this. I have my hands in his pants all the time. He probably won't even notice it's gone" -- are not actually spoken. (Xbox 360)