My 2 year old cat went out came back like this . There is a scratch under her eye and her face is a little swollen.

Hi. She must have fought with some other cat or dog. If that has happened she needs post bite antirabies vaccination. For now clean the wound with Betadine solution and apply Betadine ointment carefully as it's around eye. Make sure it doesn't go into the eyes. She needs analgesics with antibiotic but a clinical examination is required too. I suggest you to book a home consultation with a veterinarian.