I can't rule out that some other grassy shoulder with cairns exists on the Spanish side in some other account, but the one mentioned by Robert and Dino is absolutely certainly in France:
"Dans la descente prudente où j'empruntais la voie de la montée en utilisant plus que jamais le piolet, les cailloux partaient de tous côtés, Dinosaure s'étant écarté sur la droite pour suivre le raide éperon rocheux et herbeux y trouvera quelques cairns qui le mèneront jusqu'à une selle herbeuse, ce qui semble être la voie "normale" d'ascension. "
"In the cautious descent, where I followed the same route I'd ascended, using the ice axe more than ever, the loose stones fell away on all sides. 'Dinosaur' having moved off to the right to follow the steep rocky and grassy spur found some cairns leading to a grassy saddle, which seems to be the 'normal' way up."
http://ekladata.com/GyWg4PwMNmTbxl7pZxhxUX4Mv24.jpg
That's Dino walking back down the spur, with the
Cirque de la Glère below. The little
refuge in the woods mentioned previously is in the small clearing on the tip of the wooded spur, down on the bottom left of the picture.
I agree - there's just too much ambiguity to be sure where Esther died, and without knowing that, it's really impossible to guess how, when and why she came to be there. We all have our theories, some more plausible than others, but without more solid information it's impossible to be certain.