Surgery for Olive's sinus infection

Our dear little Olive is one of the lucky ladies to have escaped execution after farm life. She has been living happily and freely at Happy Hen House for at least the last year and a half. Unfortunately Olive has developed a bad sinus infection that medication has been unable to treat, and she urgently requires surgery before it spreads up to her brain. 
The vet has said that while she is not in pain, she would be in discomfort, and she has obviously lost the use of her eye making her more vulnerable than the other girls. Dr Glen is confident that surgery will result in the full use of her eye again.
Surgery is set to be around $400 and we would be so grateful to receive your financial aid, and Olive would be the happiest little lady at Happy Hen House to get her full sight back!