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Ideally she would need to be examined so we can check for a corneal ulcer or scratch or eye infection, but to do this will take some help. Your local animal control should have a cat trap that you can borrow to try and catch her then she will need to be sedated and examined as there is no way to diagnose the issue without an exam. I see that you think she is too smart for a cat trap one but have you tried one yet ? We can also get a blow dart from animal control to sedate her so we can ge there examined. I know it is not an ideal solution, but we have no way of diagnosing the issue without an exam to get the appropriate mediations on board.
Now for the appetite we can try canned chicken, chicken baby food, diluted chicken broth (1 cup broth to 1 cup water warmed up) and if those do not work canned tuna in water.
You can also try a rotisserie chicken (just the white breast meat)
Have you seen her kittens ? If she is not eating we also have to worry about her milk production and the health of her kittens.
Since she appears to have an eye issue I do not think the de wormer will help with that. Now if she does have intestinal parasites and the de wormer kills them it will help give her immune system a boost which can in turn help her fight off the eye infection if that is all it is. My concern is that she may have a corneal scratch or ulcer in which those can need medical attention to heal.
Have you called animal control to see if they can come dart her for you? That way we can get her examined, vaccinated and get some medications on that eye.