Hi Tracy, I'd tell her that there are fire safety regulations that limit the number of people who can be accommodated in the space & I'd also, in the future, have the number of people each room can accommodate clearly stated in your listing (if you've already done that, also mention that to her) Don't let her run over you, a guest who is pushy before their stay is going to be trouble. If she won't take no for an answer have airbnb cancel for you, it will cause hassles with Instant book, if you use that, but better that than ignoring a clear red flag! I rent out 2 bedrooms & a bath at my home as a suite, I don't know your market but that might be an idea, best of luck, Sally