I'd try to feed her. It will keep her alive until she adjusts to the day/night schedule of the tank. She will adjust to the lighting schedule of the tank in time. It can take anywhere from a few days to a month. It depends on the fish. Don't force it. But, feed her every other night so she doesn't starve. They are had to get to eat at first. I had live brine shrimp on hand to entice my new leopard wrasse to eat and then moved to frozen brine shrimp and then to mysids over a course of about three weeks. Now my leopard eats everything including dried nori that I feed my foxface.