Does this constitute a hostile work environment?

for the past four years i have been receiving treatment from a co-worker who continues to treat me with hostility and impatience. she acts out by yelling at me and expressing loud sighing. when work related issues arise. she shares the information with others and feels that she speaks loud enough for me to hear it. however she never brings the information directly to me. (i sit in a cublicle) if i ask her to repeat it she becomes angry and disgruntled. when i bring this to my supervisor's attention she begins to question me on "how did i ask the question," or states "maybe the yeller is having a bad day". the situation has escalted as caused a polarization in our office. some people continue to see it and have made comment to me of the unfairness, but do not wish to become involved. now i receive emails from my supervisor when saying "my co-workers" are coming to me with complaints about me. yet she never addresses me by asking me to come into her office to discuss the issues. ?

The best thing you can do is keep a diary of things that are happening. Record the day, time, exactly whay was said and anything you say etc to your supervisor. Sounds like a real ***** to me though !! This will also help if they ever try to fire you, or if nothing is ever done about your complaints as you can quit if it gets that bad and sue for damages.

This sounds as if it is going from bad to worse and will continue to do so until you take some action.
It seems your supervisor is unwilling or unable to do HER job, which would be to remedy this situation, so go above her head. Talk to someone higher up and find a solution. Regardless of your innocence in this, you are going to look bad (if you don't already) the longer this goes on. Hopefully you can find out what your co-workers issues are, and find a way to either work together or get rid of her. Just remember to be objective and rational, it will make your co-workers behavior seem all the more damning! Good Luck!