Actually, it's probably a Black Ratsnake. Ratsnakes are the snakes most likely to end up inside houses and other buildings. Every time I've been called to get a snake out of a house, it's been a Ratsnake, with only two exceptions, those being a Red-Bellied snake and a neonate Eastern Hognose, both of which were probably brought into the house, intentionlly or not, by young human residents.
The problems with finding a snake in a house, if the home's residents have not kept an eye on it, are many, one of which is that the snake may have left by the same way it came in. The places inside a typical dwelling in which even a large snake can hide are many. There was a very large Ratsnake living in my grandparents' home for years, and the only sign that it was still there were its piles of excrement and the occasional shed skin. All attempts to locate the snake were futile. One day, after my grandparents had passed away and I was staying at the house, I heard a noise in the pantry, that of cans being knocked over. My first inclination was to RUN-not because of any fear of snakes(I keep about 30 of them at my house), but of burglers, since I'd just arrived there. I realized, though, that the pantry door could not have been opened and closed without first shutting a bedroom door that opens out against it, and that door was still open. Inside, I found the culprit, a fully seven-foot-long male Ratsnake. He'd been in that house for at least two years, probably coming and going as he pleased. It was only by a fluke that he was eventually found, and that was a big snake for a native North American species!

Sharon McKenzie

Thanks for the response, and, yes, that is indeed a big rat snake.
I think the snake she saw probably went out he way he came in.
I thought rat snake ,too, but when she said dark, long and slender with a small head I thought racer.
Thanks
Warren