Will have to pull the FAA passenger flight safety rules/statutes— but pretty sure because she WAS a standout pain the in A@@ and refused voluntarily to get off the plane at the request of the pilot (legally who can insist she leave either voluntarily or under police escort,btw. The pilot commands the plane.
Don’t think they have to take all their carryon bags off just themselves with their seat assignment/ticket getting back on.. but yeah it is a hassle. For reasons of in flight safety controllable to this extent. For example some crazy sitting on the exit row tries to (cannot do so in cabin pressurized flight) open the door, say while taxiing to runway. That kind of threat on a fueled jet airliner engines running (fire hazard,etc.).
She will really have to answer for this idiotic behaviour- cost her a lot to run her mouth and refuse direct orders of the pilot.
That is true, but do you really think she has a horizon far enough out to even have an inkling of what you have said?