Hmmmmm..... I think that you could knock the can off of the shelf deliberately all day long, and you would probably never see in landing upright. Also, a fall from a shelf like that should have dented the can... was it dented? I think your lady just wanted you to have some soup!! But more than that, I think she wanted to let you know that she is still there. This is one of those thing that make you stop and think. If your first impression was "Rose put this here" and not "the soup fell off the shelf", I think you were probably right.... it's Rose! =)
Maybe you will have to hold a going away party for her, or something, so that she gets the message. LOL
Mare