I'm so glad that you were able to find her. I know that this has also happened to me with my cats. When I can't find them they are usually hiding in a cubby hole some where sleeping peacefully. One time though my RB Pepper ran out my front door without my knowledge. I didn't even realise that he was missing until I heard a cat meowing frantically. I opened the door and there he was. I'm glad he knew where he lived.