That's until you find out why that's their policy. The reason is that a fire drill happened in one of their buildings and everyone left except the man in a wheelchair that was there for his assessment, who was left by all of the staff except a security guard, who stayed with him. No one tried to carry him downstairs, or waited until the rush had gone past to do so, he was just sacrificed to the fire. The fire safety officer wasn't best pleased, and they changed their policies so that no one that needs a wheelchair is allowed to go to a facility that not on the ground floor. However their document just says that if you need additional assistance getting up and down stairs, call this number. Which as I was going with her, we didn't feel we needed additional assistance. You can google to verify this story :)
Also to note that the questionnaire that they use has been ruled illegal in the USA because it is discriminatory against disabled people.
So I say again, get your wife to appeal if it's not too late or reapply, and she should be back on benefits soon