Lucy is not an indoor cat she has access to outside via a cat flap.
The swelling is under the right eye not involving the eye at all. It goes down to her neck on that side only.
Yes she has been drinking and she ate a few cat biscuits about 20mins ago but then vomited them up back into the bowl, she usually does sometimes but with wet food not biscuits.
She not too happy with us opening her mouth, had a growl at me I can open it and it seems ok.