I'm glad you've brought that up. Seems even more illogical that Warriena would try to climb to the balcony below. JMO
Seems even more unlikely that she ended up with her back against that balcony wall, with her feet facing out, all her on her own, too.
Let's remember, that's what the witness SAW, in the moment before she looked away to her flatmates... when she looked back, Warriena was "twisting" around, and "climbing" the 'right' way round to get a grip on the ledge (too low to be gripping the rail....?).
But before that, W was hanging, feet out, back against the wall. What was she holding onto then?
edit: all y'all inb4 me! <3