Some Muslims are more free-thinking and follow their own conscience. Others feel the need to blindly follow the opinions of scholars down to the letter. This employee sounds like she is doing that. There is a very strong view among imams and scholars-at least the ones I've heard- that to make an income related to haram behavior such as drinking,using,selling alcohol(or pork,pornography,whatever)is not acceptable. If she is so hardcore she should have known this. I think she is just trying to make a political stink.

This issue was big in my town in the United States. Was it ok for Muslims to serve (or even touch) alcohol while working as waiters? Some did, some didn't. It was a personal decision.