Do you have table salt? That with water will make saline 2 tsp per quart, boil it and cool. Any drug store has ready to use saline and eye wash. The eucalyptus might be okay for sinus, but I probably wouldn’t use it in the eye.
In her weak state, I would remove the egg from under her, and break her broody spell. That is best done in a wire dog crate with no bedding, and some food and water. She may eat better if she is not worrying about sitting on an egg. A broody may not eat for a day or two after you start breaking...