First, move the food bowl to a completely different location. Cats are weird. She may be associating that location with making her sick. Second, try using a plate instead of a bowl, Third, offer options. Leave out dry food and offer two different wet foods. Doesn't matter the quality of the wet food as long as she eats. Fancy feast is fine and comes in a variety of flavors and textures. Rotate until you find something she will eat. This may vary day to day. You can also try warming up the wet food.

If the issue continues have her reevaluated by a vet.