Hello, Siobhan, and welcome to BYC!Glad you joined.
Is there something in her eye in the upper back corner? If you can get a tube of terramycin, that would be good to put in her eye twice a day for 7 to 10 days. But I would irrigate her eye with some saline first and make sure there is nothing in it.
I agree. It is what I use. Good luck with your birds and have fun...https://www.tractorsupply.com/tsc/p...erm=4585375807245420&utm_content=All Products
