I believe that trespassers must be warned first that they are trespassing and then be permitted to leave. Only if they don't leave may the property owner use force to eject them. Even then, only that force necessary may be used.
I also believe that having a gun in your hand constitutes "use of deadly force". You don't have to fire the gun or point it at any particular target. Since the trespassers could possibly have been ejected using less force, the person holding the gun has used excessive force.
I'm sure we can all agree that an order from a policeman who has a holstered gun carries with it a threat that would not exist if the same order came from an unarmed person. If the officer draws the gun, that would seem to be greater force than just having the gun.
I think she complied with what you said except she had a gun in a non threatening position. I worked in Mississippi before Obama and as someone else here on this thread pointed out there has been a rise in crime with a racial component. She is 70 and fat not suited to wearing a holster and KOA camp grounds would have rules posted. Since the video is one sided I can’t see what the couple were doing and the reporting is slanted too. The woman of the couple was quick to add the racial component which I didn’t pick up on in the couple’s video.