Owner has no idea if house is occupied, what to do?

[Andrey Y.]

Hope everyone is having a great Monday/Tuesday AM. I have a very nice elderly lady who wants to sell me her house. Pretty well motivated. Unfortunately, she does not know much about the state of the house (she lives 1000++ miles away). She later remembered that maybe her sister collects rent checks, but she isn't sure. In fact, she forgets things even stated 5 minutes ago! Is going to the property and knocking on the door even a sensible option? (she suggested that) Let her call her sister and hope for the best? She didn't take my offer of calling her sister myself. Thanks guys.