See post 29.
As I understand ‘standy’, you will be boarded and seated if a fully booked plane has a ‘no-show’.
Evidently she was boarded. She was on the plane. Per the article; she was asked to leave the plane.
If you’re on a plane, then yeah. You DO have a reason to expect to fly.
Unless SWA has an idiot policy that allows latecomers to hold up 100 + people and board at will.