You need a plan so you won't get caught with your pants around your ankles the day she is going to tell you yours. What would your reaction be?
Meanwhile I'm not saying that you need to rush to put the house on the market but it won't hurt to get some realtors business cards and leave them laying around along with some releastate brochures looking to rent or buy a new place.
You are taking notice of her doings font think she won't notice you "planning" something.