Just spoke to the vets, they said what i was hoping for which was just to keep an eye on it and take her up there if there's any problems.
I didn't blame penguin in t'end, am rubbish at telling porkies, open my mouth and the truth comes out whether i want it to or not.
It still looks fine today, ever so slightly swollen, but i'd be shocked if she wasn't tbh, and there's no blood or discharge. Have a checkup booked for friday so i'll bring it forward if i'm worried but otherwise that should be the end of it i hope!