This still is taken from the latest videblogothing at 007.com, home of all the most amazing Skyfall-related excitement you could hope for. Further investigation of the videblogothing reveals that she travels down the escalator, but is not seen travelling up it. In what appears to be publicity for the film's publicity, we also see the actress having her photograph taken.
And on that bombshell, I'm going on holiday. See you in a week or so.