New baby ettiquitee is a minefield isn't it.
I when ds1 was tiny I hated other people touching him, yet I let them through gritted teeth. When I'd chilled out about that I'd have been devistated if someone refused a cuddle - how could they, he was the most perfect, beautiful baby every to be born
Her brother could have called before she set out and said that although they'd invited her, things were a bit frantic (even made up an appointment if he did not want to sound streesed) or even taken her to one side once she was there and had a word.
But not being allowed to make yourself a brew after a long journey is downright rude, as was the stranger comment. Yes, new mums are allowed to go a bit loopy, but by what she said there were others there as well.
Maybe something had gone on before and they were making a point to the GP's, but on the face of it yanbu