It hadn't fallen out, but it was hidden in the swelling and there was blood around the eye and on her snout. After I got the perishibles put away, I put Della on her leash and we headed for the car. Fritz was less than pleased about sharing the back seat with such a "feo" dog (we just learned feo means ugly in Spanish). Rather than risk seeing the blood he turned his face to the window and cupped his hands around his eyes the entire trip to the vets. I guess he won't be pursuing a career in medicine.
Fortunately there appears to be nothing wrong with the eye itself, but there is a gash on her eyelid. We got some antibiotics and medicine for the pain and swelling. Fritz covered his eyes for the trip home as well. I couldn't help thinking about Hank the Cowdog and the case of the Double Bumblebee Sting (we have very small rattlesnakes and copperheads in the area, but I don't in fact know what attacked her).
At home we realized that she was trying to scratch the area and that would cause the bleeding to start again. The Toolman had to make a trip to the big city to get a cone of shame for her to wear. (we're big fans of the movie UP, in fact we've started calling her Luxo Jr. after the tiny lamp that comes out during the Pixar logo).