Swollen red eye

[Jetty Betty]

Something is up with Bettys eye. Its Red, swolen and she's squinting and rubbing her face against couch. A few possibilities I was thinking of; a) she was scratching her face pretty good over the weekend-wondering if she scratched her eye in the process. B). Just started her on Proin this week for incontinence issues- maybe allergic reaction? C). Food allergies- switched her from earthborn to Fromms and now moving to Nutrisource. D). Conjunctivitis...
Any ideas before we go back to the vet??

 

[Manydogs]

I think a photo of her eye problem would be most helpful. Can't determine without seeing what it looks like.

 

[2BullyMama]

a picture would be helpful, but I am leaning toward the scrathed cornea