Becky is right it can happen to anyone, when you step out of the shower the first thing you put on isn't your shoes, so you are generally barefoot for sometime. Many clients will wear shoes into the bathroom and that will track salt, sand, dirt (how many condo's are near construction sites) into the suite and fresh from the shower wet feet can pick up that dirt in a very short time. It's an honest oversight, something that when she's rushing to get everything else ready she may forget to double check.