I assume you mean selling the house, not the contents. I agree that talking with her is the most direct way to find out. Are you interested in purchasing it? Are you asking because you want an opportunity to buy it before she lists it? If, so probably best to chat with her. In the alternative, if you want to see if it is already listed, I would check the public real estate websites like Trulia and Zillow. I don't know if there is public access to the local MLS in your area, but if there is, that's the best way.