They deserve to lose at least half of their clientele for this.
Since the county voted nearly 63% for Trump, I suspect more than half will find somewhere else to eat.
For a couple of weeks lefties will be lining up around the corner to eat there. It will be on all the news. The owner will be crowing about how standing for one’s principles can actually be good for business and how proud she is of the stand she took. Then they’ll evaporate, moving on to the next outrage du jour, and this place will be left sitting in their rural area that went for Trump in large numbers wondering what they can do to get anyone to come back in. Then she’ll begin firing her staff, the staff that notified her of their concern that Sarah Hackabee Sanders eating there. Then she’ll shut the doors for good.