She had been up to Pic De Sauvegarde the day before, plus from pictures it seems the right trail is well marked, so the theory she mixed up the lakes and climbed a wrong peak by accident makes no sense, IMO.
If I could find her comment about getting lost on the trail and accidentally following animal trails shortly before her disappearance I would post it. That comment gives some context. Hopefully the person who originally posted the comment will share it again.
I'm not saying that she climbed the wrong peak. Indeed, she would have climbed the correct Pic de la Glere using the wrong lake as a clue regarding the route.
I'm just trying to understand how she ended up where she did.
There's no evidence that she was at the Refuge de Venasque. If she stayed overnight at Refuge de Venasque, as Dan has repeatedly pointed out, she would have had access to wifi within 30 minutes of the refuge. Yet, there was no contact on the morning of Nov 23.
On Nov 22, she told her partner that she was still in the same area, and that she planned to hike to Port de la Glere the following day. She said that she might dip into France and she hoped the Refuge de Venasque had a Winter room. That is the order of information she shared.
She did not say that upon descending the Pic de Sauvegarde at 4:30PM on Nov 22 that she would enter France, overnight at the Refuge de Venasque, spend the day hiking in France and return to Spain via Port de la Glere.
All of this leads me to believe that Nov 22 overnight, she remained in Spain. The following day, she hiked directly to Port de la Glere. Somewhere around the Port de la Glere, something went wrong and she ended up near the Pic de la Glere - which was not on her intended route.