More than likely they are going to refuse her right off. But why even take a chance with that? Chances are some of the same supervisors are going to be working still and they will have remembered her. It has nothing to do with who is on the floor, they have no idea who is a no-rehire, etc. But supervisors know and they remember.
My personal opinion is to go someplace else and not go thru the embarassment. If she was a no-rehire in the past, the agency probably doesn't know, but if she gets a "do not send" now, it will influence her future jobs with this agency.