Please don't flame me for these comments! I am only making some assumptions based on the information in the original post. One cannot make any form of diagnosis without the performing a history and physical and obtaining the appropriate diagnostic and laboratory studies. That said...

From a purely medical perspective there were a couple of things that the OP mentioned that piqued my interest. The fact that the pax got up and started moaning and didn't respond correctly when the F/A asked her to sit down could indicate that there was a problem with the pax's mental status (and there are a million things that could cause this ranging from hypoglycemia to organic brain disease and the million things in between). Had I been on the flight I likely would have volunteered to have a brief chat with the pax to determine if there was a reason to have her removed. The fact that she tried to get up again further supported my curiousity about the mental status and the fact that something might have been going on.

The use of the foot medication and the positioning might have been a factor of an altered mental status just as easily as it could have been because she had foot fungus, debilitating arthritis, or even plantar fasciitis. You just never know without checking.

Overall, when you look at a patient with an altered mental status there are so many things that have to be ruled out before making a diagnosis it can take some time, so if there was ANY sign of altered mental status it would have been worth removing the pax for her own good as well as for the good of those around her.