It is sad, but administrative staff often do get bullied. They are considered to be easily replaced. I used to work as an admin, and although anyone else could be late to work and get away with it, admins & clerical workers would be fired if they came late to work even one day.

I have found that the more a person apologizes for things, the more likely they are to keep getting bullied.

I think if I were you I would try to be supportive. This person probably has a self esteem in the gutter by now. It can affect her work performance too.