Awkward Work Situation

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>start new job in January
>start talking to shy girl
>we get along very well, she laughs at the stuff i say
>gets me drinks once in a while
>she asks me to hang out a couple weeks to do a common hobby we enjoy
>last weekend we even get food afterwards
>this week arrives
>she gets cold and distant
>tells me how she is sick of dealing with people
>i get a little overeager and try starting convos with her
>we were planning all week to play cards yesterday, even as of Friday AM
>she sends me a text yesterday saying she is tired and isn't going
>I have no idea what to do now

I have to work with her tomorrow and sit by her. Should I just not make any effort to talk to her?