She's claiming in that second video that she doesn't use green screen though. She could just simply be fibbing of course then come out with some bollocks later about how it was all a 'mixed multi media stunt', that's the only way I can imagine she's achieving this effect?. She's got a few videos up on youtube if you search her name. I haven't found any 'missing wrist' or 'missing ankle' videos from her yet and we'd assume she'd be able to do that as well once she's got the technique down on a finger, green screen and CGI or otherwise.
Until I see someone walking around in public pull this off? .. I'm going with that it's just a jazzy effect so far dependant on being viewed on a screen.