She probably has no idea what's going on with her eye as it's been gradual. But for the tumor, she looks GREAT! Good color, alert, 'happy,' and a good size. It's like a dog that has to get it's leg amputated for whatever reason - they don't know they're three-legged. And they adjust fine and continue to be happy and gimpy!
It is sad she had to get a tumor as no tumor is good. But this is better than a liver, kidney, etc., tumor. She may continue to live a long life as long as the tumor is external.
You are definitely doing the correct thing, Don. Why put down a dog with three legs when s/he's happy and adjusts? Good job. Give her my love.