Does she have a sense of humour? How about a swear-jar where she puts money in every time she swears? Its a good way to point out how many times she does it. Sorry though, its quite a downer hearing it so much. Should be reserved when its needed, like dropping a brick on a toe (yes I have!).

Other than that, just say 'not in my house, and to stay here you have to obey the rules'. Worked when I was a kid...