Why would a coworker who hates you sneakily follow you around?

I have a female coworker that seems to hate me from the very beginning. While being friendly and smiley with everyone else, she would be annoyed when she sees me and actively avoid eye contact (only with me) in the rare cases I ask her something. When she enters the lab and sees me she would say something like „yeah right“ as if I’ve previously done something to annoy her. She would also look over her shoulder when I walk past her as if she is hiding something and lately I feel like she is following me around at work. Since we hardly know each other my first guess is that she is afraid I might snitch on her and her extramarital affair with my „supervisor“ who happens to dislike me too and also teases me from time to time. But if that is the case, why would she snoop around and why would she actively dislike me if everyone else already knows about their „secret“ since I’m the newest one there?

Why would a coworker who hates you sneakily follow you around?
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