I agree
@Grouse and
@CoverMeCagney.
On 22/11 IMO, ED could have retreated back to a familiar place. Even if ED had intended to cross the Port de Vanesque that evening as she told DC, perhaps she assessed the situation when she got to the port. And like many of us have concluded on her behalf, to ED it may have appeared too risky to get to the Refuge de Vanesque that night - ice, dark, cold, cable that requires certain equipment to attach to, unfamiliar trail, etc. If she listened to her safety instincts then yes, I think she could have just kept marching down the trail to the Cabane at La Besurta for second night. And we understand (or believe) there is no cell service at the port or the Cabane, so no call to DC.
And that of course opens up the opportunity for something to happen to her via a third party since it is at a parking lot / road or other scenarios we have discussed here.
As for the Maledetta Glacier idea, I have considered whether ED spent time there earlier on 22/11 before her summit of the col, as
@RickshawFan has suggested. And I suppose if she didn't explore some if it (I would doubt she'd attempt a formal climb without crampons) on 22/11 then maybe she did on 23/11 as a follow-on to above.
And that of course opens up the opportunity that ED had a terrible accident on the glacier as Rickshawfan has described, or other scenarios we have discussed here.
Of course this is JMO... but like others here, I continue to mull over the facts to try to make sense of them in some way. It is just hard to fit all the little pieces together.