Some people, like me, are just not morning people. I feel forced to be cheery until I have had my breakfast, coffee and started getting ready. If I am forced to go in extra early it could be much later before I feel up to formalities. Or she is miserable in that job and can't leave for some reason. Been there too. Joking with her might not go so well. In the afternoon when she is more receptive you could ask her if she is not a morning person and she would probably spill it. Then I'd ask her if she wants to be left alone in the am. Even though she doesn't say good morning back she might appreciate it anyway. Or not.

I agree with lulu. She is who she is.

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