Mean girl problems

I have a co worker who recently cornered me in a doorway to yell at me after already yelling about me from down the hall to coworkers and stomping up to where I was.

I told her that [quote][/quote]I am here for the patients in the building and not for her and that she is not the boss of me and is wasting her breath.[quote][/quote]She then did leave the room and never bothered me again.

[b]But now I dread every upcoming shift, what are some other ways to defend yourself against a mean coworker without being mean/aggressive yourself? I am not gonna lie I was scared, I have never been cornered by a coworker[/b]

(Bosses and HR are scared of her so going to them is not an option)