Moreover, the information provided by the other party contained a very important point: she had likely been in the restroom for over ten minutes. Before that, no unusual activity had been noticed in the stall next to hers. This meant Ross's fiancée had probably disappeared about twenty minutes *before* she even entered the restroom.
Ross had been waiting at the restroom door the whole time, and the women's restroom had no other exits. This indicated the perpetrator must have been waiting inside before Ross's fiancée went in.
Ross's fiancée had just gotten off the plane. Both she and Ross had some status but were generally inconspicuous. They were unlikely to have intentionally offended anyone, nor were they prominent enough to be used as leverage against their families. It wasn't very likely that someone had specifically targeted her. So, is it possible that the perpetrator's original target was actually this counter girl?
