I'm sorry that it seems to be spreading. Do the best you can to rinse the eyes. If you don't have saline, I suggest that you use sterile water or you can boil water for 15minutes, let cool and use that. Saline will be much better and won't burn like water will.
What antibiotics are you going to get? We can try to help you with dosing so you makes sure she gets what she needs.
I would also take a look inside her beak to make sure it's free of mucous, canker, pus or lesions.
https://www.backyardchickens.com/threads/sinus-infections.1074036/