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From looking at the coop I don't see any obvious reason why she's not using the coop with everyone else, other than it's just become a bad habit to go the basement. I would try putting her in every evening (doesn't even have to be on a roost, just push her through the pop door and shut it) and...

Your space is good so it sounds like she's just gotten into the habit of going to the basement, which she considers home, since she can get access to it without issue.

So she grew up with the rest of them as a chick? How big is the coop (or even better, do you have photos inside and out?) Roost time rumbles may be causing her to get kicked off the roost/out of the coop.