Female Coworker suddenly goes cold one me (I'm a Guy)?

We are in the same team and sit in the same area, and usually we'd chat about work related topics. Sometimes she'd initiate and check in on what I was working on and vice versa. We used to at least greet each other good morning, either in person or at least over chat if the other party looked busy. When we have meetings, we'd maintain normal eye contact when respective parties are talking.

However recently she start avoiding all eye contact, when I speak during meeting, she'd look at the presentation or the slides and avoid eye contact. When I messaged her good morning, she'd just leave it as seen. I have no clue what I did, but this abrupt change has left me baffled

Female Coworker suddenly goes cold one me (I'm a Guy)?
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