I agree with you Expat. It made me feel sick to the stomach.And NOT because of the OP.
I understand your concerns OP, however, i really think that
you will hurt your friend very deeply if you go without her. She may well be aware of how you feel about her son, and his behaviour, but he is still her precious boy. She still loves him. It will Still hurt to think that a) he is excluded, for being too lively, b) she is not invited either due to him.
It sounds to me, that he is just plainly bored playing with 3 girls! What 5 year old boy wouldn't be? Its what they do! He will grow up, and out of it.
I just can't see how you can go away at all, with all this going on. I see you love your friend, of course you do, I gather that from your posts. I think there are far to many attacking, horrible posts on here. Looking at things on the very surface, without really thinking about your situation.
I can also see, you don't actually want a girls ( adult girls ) weekend away, it was to get the children away too...
Having been excluded from a holiday with friends when we were about 17,( still have no idea why ) by a note being pushed through the door... I never got over how that made me feel. Even now, when I think of it, it makes me upset inside.
ALl I can suggest is that you re think not inviting them. That you do all go somewhere, perhaps in england, if you fear the travel would be too difficult. If she is a real friend, that you do love, you need to talk to her about it. tactfully. You must , for the sake of your future friendship. You can find away to talk without being nasty. Perhaps just tell her all of this, but say you couldn't possibly go without her.. that you felt so concerned about it, that you had considered not asking her, but realised you couldn't/didn't want to do that to her.
i dont have all the answers, obviously, I just do know that your relationship with her will be ruined, never the same again.