It looks like a sty. Treat with warm compresses 3-4 times daily for a day or two. If it does not heal up and go away, take her to your vet, it could be something else. Wash your hands and scald any cloths you use for compresses, or use a warm, NOT HOT, tea bag and discard after each use. Wash your hands after using the compresses so you don't transfer germs to her other eye or even to yourself.