Blimey, can't believe the responses to this. I was only curious as to how others would have responded in a similar situation.
There is a bit more history to this girl really, she has been very rude on many occasions to lots of adults in our ante natal group who are all losing patience with her and not wanting her to hang around their own kids too much these days, which is fair enough IMO.
At the time of these comments Dh wasn't going on and on. DD was chucking marbles around our lounge, they were bouncing off the windows, the vases, the tv screen, I'm amazed nothing was broken. She's 7, she knows that is a stupid thing to do indoors. DH removed the marbles and told her she was being silly. It was a short chat, but our guest dived in with these rude comments. I've thought about what some of you have said about embarrassment etc but I don't think the situation was long enough for that reaction.
I just can't imagine any other children that we know making comments like that. And the continued comments at home about a rubbish sleepover, it's just all odd and rude and needs addressing. We've known her since birth - ante natal group - but she seems to be getting worse very time we meet.
I love kids, I think I do understand them, but I've never met one that is quite like this. She never seems very happy, everything is wrong, it's hard to explain, but there seems to be no 7 year old joy and exuberance. Just moaning and rudeness .
Someone asked earlier about her home life. We're very friendly with her parents - go out for meals without kids etc - which makes this more difficult IMO. I think she has been treated in a very adult way - she's an only child (don't blast me for saying this!), but i think possibly they have a lot more focus on them, two adults, one child, its obvious really. They adore her, which is great, but maybe too much to discipline her much or impose any boundaries.
I do feel I was right telling her mum, I would want to know. It's not a case of prolonging things, just filling her in on what her kid has been up to. But perhaps with hindsight it would have been better out of earshot.