Is she not interested anymore?

A coworker was interested in me from the day she started at my job. She always stared at me, so I decided to talk to her. Instantly from her body language, I realized I was right that she was interested. Because we work in separate departments, it’s hard to talk to her. The last time we had a genuine conversation, my coworker ruined it by trying to make fun of me in front of her. After that, we never had an excellent chance to talk. I decided to focus more on work anyway. But she still always stared at me. She even came to my desk to speak to other coworkers but kept her attention on me. But the last few days, she's been different. She looks at me like she's angry and doesn't stare anymore. She only looks at me if she's standing far away from me. And she gives me glances. Like if we make eye contact, she immediately looks away. Sometimes I notice she gives me quick looks when she thinks I don't notice. Can anybody tell me what's going on?
Is she not interested anymore?
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