The spot of the incident is not all that far from the entrance. It is a big, open area where you can head off to look around in a variety of directions. I once set out from there to find the Paso de Legarto line with only a vague and somewhat inaccurate description of where I would find it. I spent a lot of time looking around, nearly using up a 150 foot spool, before I found it. If I had set out in the correct direction, I would have found it quickly.I don't have experience with the cave, but my impression from reading the account on cavediver was that the instructor looked around her general vicinity as well as deeper into the cave, and then came back and went closer to the exit. With all that looking, I would think she would have seen a line that was tied off near her initial location of lost contact. When the team encountered the deceased, was the deceased at the point of lost contact? Also, in my mind it took time for the instructor to go back and forth searching. Now the exiting team could have been mistaken about seeing her only 5 min before (which would have been what 15-25 min? after the first lost contact.), but the details that are known seem to be verified by multiple divers in several teams (again based on what is posted on cavediver).
The instructor exited the cave looking for her, got more gas, and went back in before encountering the other group. I don't know how much gas he had left before he got more. It sounds to me as if she should have been out of gas by the time the other group encountered her if it was only 5 minutes.