I guess I'll put in my own two cents and tell you what I learned from my experience. I don't want to take credit because a lot of this I learned from other owners. Nor do I want you to take everything I say word for word literally. Some of the people that tried to help me were actually corrected by others, so I'll give you the advice that worked for me or that I think would work best.
Generally your snake won't be far (<i>at all</i>) from where she initially escaped. Corn snakes ARE considered nocturnal because they usually look for food in the night time. Depending on when you last fed her, she will get hungry and likely will start looking for food. When this time comes you could set up some sort of a trap involving a mouse, but be warned snakes can go for an extremely long time without food and she may just ignore the mouse.
I'm not sure where in the house you lost her, but if there is a pile of shoes or a bed to hide under or something she may have gone for that. You should know by now that snakes love to hide. Also, if this particular part of the house is generally cold, you could set up a nice hiding place (maybe even a familiar one taken from her cage) with a warm heating pad or something to provide heat underneath it.
I would set out some water, too. This won't help catch her so much as it will keep her from getting dehydrated.
I'd like an update on what you've done thus far. What, if any, posts have you read on this topic (besides the one jmksnakes gave you), and what advice have you tried from those posts? Where have you looked so far?
