[souffle]

It is very painful for her to have a ruptured eye and something needs done about this very quickly.
It sounds as though the teeth and malloccluded so they don't meet properly and that is why they are not grinding down. It is possible they are growing in to the roof of the mouth and could have damaged the eye.
All things considered and her age, if she was ours we would give her rest.
It is the last great gift you can give. I hope you can settle the decision in your heart and make it soon.