I have trouble believing that part of this woman's story. If she actually tried to do that, they wouldn't be dismissive of the act, the FBI would have questioned her, and the airline wouldn't have said this was a lot about nothing.
I would be interested in knowing more about Shiela Steele -- does she have any reason to want to put the Osteen's in a bad light?
This is my guess on what happened, having read several different articles: victoria osteen went to sit down and there was liquid of some sort in her seat. Stewardess hurriedly tries to clean up the mess but some remains. Victoria said she doesn't want to sit there, doesn't want to walk around Colorado with a big stain on the back of her dress. Stewardess repeats her command for Victoria to sit, Victoria says no. (failure to comply) Stewardess will not have her authority questioned and whines to pilot.
It's highly unlikely that Victoria Osteen went banging on the cockpit door.
Just my guess.