If she isn't the department head, then complain to the department head, and your boss
If she is the department head, then complain to her boss, and your boss.
But only complain if not going into that department PREVENTS YOU FROM DOING YOUR JOB.
Do not complain if not going into that department keeps you from socializing with other coworkers. They can come to you.
I cannot stress the importance of this enough! You are there to work first. You want your boss to see you as a good worker. You do not want your boss to see you as a whiner who thinks she is entitled to a particular social life within the work environment.