Hmmm . . . maybe she thinks she is better than you, as well as the rest of your colleagues. My advice to you is not to let it get to you. That will show that you've got class and, when reviews come up for everyone, there may be some job losses due to their behaviour toward you. In the meantime, don't say anything to anyone, don't show any dirty faces or ask anyone anything. Always have a positive expression on your face if you don't already. Always be friendly and wave, even if they don't wave back. Remember, all the employees are being watched by supervisors, so watch your back and don't worry about the others. You will come out ahead in the end, while some others are out looking for a new job and getting to meet new people and learning how not to treat people. Remember, too, the old adage . . . "What comes around, goes around." 
