The Lexington area is about 6,000 in population. My guess is that she found one or two individuals (probably a cook and a waitress) who were gay, and they were able to get friends hired. The owner and the employees seem to be all like-minded social warrior types.
If she runs her business by employee-votes....it’s doomed for the most part. They might get some upsurge this week of Hillary-voters showing up and making up for business losses, but I just don’t see that being a sustainable business plan.
The county has ~22K people, with another city about as big as Lexington. The area went for Trump 2 to 1. It is a tourist area, so I would expect filling tables isn't a problem during the summer months. The problem the Red Hen might have is during the off season. The owner just alienated 2/3rds of her local customer base.