Need help with my crush!!!?

[Hai Ngo]

I wished my crush a merry christmas but she didn't reply and my message wasn't marked as seen either. But I know she was active on facebook because it appeared on my timeline that she liked and commented on her friends' statuses, and it was after my message was sent. I know that if you click on the 2 talking clouds icon you will get to preview a small part of the message without having it marked as seen. She has never ignored my messages before, in fact she always replied as soon as she's active and replied nicely (always longer than what I messaged her). What should I do? Should I double message her? It has been over 36 hours!!! I plan to go to her workplace (she works in a restaurant) next week to wish her a happy new year in person but I don't think it's gonna work out after this. Please!!! I need some advice
Besides, should I wish her a happy new year via text or in person? I don't want to make her feel awkward or terrify her at her workplace
Please I need serious advice so stop saying merry christmas, thank you
So far she still hasn't replied and my message isn't marked as seen either, it has been 4 days, what should I do? According to her facebook activity I don't think she hasn't read it.
@Beth Yes she's a Christian