Unusually, she wouldn't step up for Dave when he came home for lunch...
SHE KNOWS!!!!!!! (gasp!) I *knew* they were smart.........
And, now that Dave's home from work, he can set about tinkering with Nila's cage to up the safety standards.
As for you, just how big was this snake? What kind was it? Constrictor type? Something else? Have you got any ideas other than "brown"? I know you have different beasties than I have, and they could be mighty fearsome. Still, not every snake is a baddie. And maybe he was hunting vermin? On a side note, maybe you should have a sacrificial hamster? I'M JUST KIDDING! Put out some Root Beer for a decoy.
Perhaps you can spend a day filling foundation crevices outside one day soon. How about mounting a nice statue of a raptor near the window outside, someplace where outdoor snakes can see it an be afraid, but indoor Ringnecks have no clue. Lastly, I think you should keep eyes well peeled to get a more satisfactory glimpse of your snake.
Best wishes!