Wow! I really feel for you. That woman would disgust me as well, and make it almost impossible for me to work there. That said, unfortunately I think you will be fighting an uphill battle if you were to sue.

Generally speaking, hostile work environments are created when a work environment continually offends an employee based on legally protected characteristics/factors. These characteristics/factors include things like race, religion, gender, ***, etc.

Other reasons that make a work environment unpleasant are generally not actionable due to the "at will" employment doctrine. It sounds harsh, but your employer probably has a solid defense by simply stating: "If you don't like working here, then quit."

I'm going to qualify the above by letting you know that I have not extensively researched this issue. I will look into it further tonight, and if I find something that states otherwise, I'll post it here.