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You may have to show them up the stairs or on to the roost the first few nights and then after that they will take care of it themselves.
I have 4 pullets who are figuring out how to get up and down still. 3 nights helping them up but they can all get down on their own now.
If she is broody you could slip some eggs under her or find a few friends that are the same size. You'll want to make sure they are healthy. There are lots of threads on introducing chickens and quarantine.
She'll definitely need a friend or two, though. Maybe even 3 or 10.