I do feel sorrow for this lady, but you are correct. People tend to lose sight concerning the 55000 other employees hanging around. There is probably an avenue for appeal already in place and listed in the employee (CM) handbook. I'd check there and see if there is one, I'm sure with unions in place, it is there. Follow those procedures and you have a chance. Harass the bosses, it will be a lot more difficult. Unfair, but the way of the world of business and when all is said and done, Disney is a business.
It could be an error and if what has been reported is true, then that is exactly what it is. Approach it with that possibility in mind and things might work out. Run in with fists flying and the likelihood gets a lot smaller. I'm pretty sure that Florida is an "at will" state so they don't even need a reason to terminate. Someone correct me if that is not the case in Florida.