What do we do with a friend who makes a terrible house guest?

One of my wife's friends (a friend, not a very close friend) recently came to stay for a week. She made a terrible house guest, offering no help with meals etc, eating our fridge empty, leaving her things all over the house and spending much of her time reading her emails. We're a pretty easy-going couple but this woman really tested our patience. Anyway, she left and we've seen her since at a few parties etc and she keeps raving about how good a stay she had and how she'd love to come back to see us again. My wife has swerved the issue a few times but this friend is getting more and more direct in her requests to come and stay. How do we avoid this but keep her as a friend? I know the obvious answer is if she was a good enough friend you could tell her but a) she's not a very close friend so may take the advice badly and b) each little thing she did was not a big event on its own but combined made for a terrible house guest. Any ideas?What do we do with a friend who makes a terrible house guest?
Quickly turn your extra bedroom into a library. That way you could respond by telling her that you have changed the spare bedroom into a library which would limit guests from staying with you. If, by fate, she does enter your doors as a guest, politely sit down with her and tell her what you expect. Say it in a loving way so she won't be overly embarrassed or hurt.