In the workplace, to me, it's less about wondering what the other person has got, and more about how can I conduct myself professionally, how to get the work done without having a confrontation and what is protocol to deal with others in the workplace that are like little roller coasters.

One of the ways, at my previous location, that I disagree with the bosses on how to handle the more hostile employee, they said, if she stops and talks say sorry I am not interested. I devised, love to chat, but maybe later, I've got to get back to work. ((just in case there was an abandonment/rejection trigger in there)) My way, worked better.

If you are having problems, start keeping a notebook. Write down FACTS not emotions about instances, so when you do bring a complaint to management, you aren't the one looking like the fool.

Best of Luck, whatever this woman may have, it's less about diagnosis and more about how you are able to keep yourself professional ((boundary talk here))