I wouldn't be surprised if BASSA subs were being used to pay for the commuting costs of reps.
It would not surprise me if she was attempted to be transferred into a comfier seat for her commute by onside cabin crew.
It would surprise me if that happened with the captains' agreement, and I would have thought that most captains would be scanning the Pax List for her name, and ensuring that she travelled in the correct class (unless already upgraded by groundstaff, of course, which is a disctinct possibility).
As to a full flight and junpseats ..........