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Without further information it is difficult for me to provide the best advice but I will certainly try.
Please reply when you can and we can continue the conversation.
When an eye issue like this is not improving with treatment, it is concerning and Millie needs to be seen for a re-check ASAP.
We would worry about a non-healing ulcer, chronic Dry Eye, glaucoma, a resistant infection etc.
At this point, we need to check for any ulcers, measure tear production and measure the pressure within the eye.
Treatment will depend on what is found and may include alternative antibiotics, anti inflammatories, pain relief and/or a procedure to help the eye heal called a grid keratotomy.
I do hope that this has been useful and please let me know if there is anything else.