@Cryss
Sometimes the more you read, the more you can become anxious over what can happen. I do agree she is a bit disheveled (some of this could be feathering/genetics?), does she take dust baths and preen with the other girls?
This is your non-roosting girl? If she doesn't roost, then I would surmise that her breast, crop and underneath her will be more sparsely feathered, since those would likely be rubbed off over time by her not roosting.
It's hard to know about crops sometimes by just looking at a chicken, the best thing to do is feel her crop when she goes to bed (it should be full) then check it first thing in the morning before she eats/drinks (it should be empty or flat). IF the crop is emptying overnight, then I would just watch her - check her at least once a week.
I have a few girls that look (and feel) like they have swallowed a grapefruit when they go to roost every night, but their crop is flat/empty in the morning (the poop tray also bears witness

) I still check my girls fairly regularly.
Here's some more information with photos and video
http://www.the-chicken-chick.com/2016/02/pendulous-crop-in-backyard-chickens.html
http://www.the-chicken-chick.com/2014/06/chicken-anatomy-crop-impacted-crop-sour.html