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She is 2 years old and otherwise she is in perfect health. She has no other symptoms and never had lice or mites. She doesn’t seem bothered by her eyes either which is why we’ve not thought there was anything wrong and only recently thought we had better check it out as the red area around her eye seems more puffy than usual.Welcome To BYC
How old is she?
If she's had puffiness for a year, it would be hard to know the cause.
I would flush her eye with saline, remove any bubbles or pus or debris and apply some Terramycin eye ointment in the eye a couple of times a day to see if that helps.
Has she ever had any other symptoms like coughing, sneezing, mucous, etc.?
Any lice or mites?
Watery, swollen and bubbly eyes can be a sign of a respiratory disease, such as mycoplasma gallisepticum (MG.) It can come and go because it is a chronic disease. Since you may need or see a vet for eye ointment, your vet could also treat her with Tylosin, oxytetracycline, or Denagard which can systemically treat MG. But do clean her eyes with saline eye wash. It is too bad that you cannot get Terramycin (oxytetracycline) eye ointment without seeing a vet in the UK. Here is some reading about MG:
https://extension.umd.edu/resource/...mycoplasma-gallisepticum-mg-infection-poultry