I agree, off to the vet if possible.
Animals are great at hiding illnesses so as your girl is clearly displaying that she is sick, then the could be more to it than just an eye infection/scratch etc. If she had a weepy eye and displayed no other problems, I would have though maybe she could have scratched herself or something, but when she is out of character like that, I would be concerned.
It is better to be safe than sorry.
Good luck, hope she will be ok.
Let us know what happens.
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