Colleague didn't say goodbye before leaving for the holiday?

A colleague came in to my office to pass on some work-related information five minutes before she was going to leave for her Christmas vacation, and afterwards she just left without wishing anyone Happy Holidays, or even saying a goodbye. Is she self-centred, or was it actually one of us who should have wished her happy holidays and//or said goodbye as she walked out the door? I guess at the very least, I found out that I'm not on her mind as much as she is on my mind.

Colleague didn't say goodbye before leaving for the holiday?
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