I remember reading a book as a tween. It was an "old" book then and this is probably twenty years ago.
I have a brief scattered memory of it.
I think it was set in, around or shortly after the Second World War
The family had moved to France and did not speak French.
I think the girl may have been named Sally or something beginning with S.
I remember a scene where she went to the shop to buy pencils and managed to correctly ask for cheaper Ones.
Her school work was returned to her covered in corrections as she didn't speak the language
They had a shared telephone line with half of the street.
Her teacher had a chipped tooth which she found delightful
She told someone to go boil their head.
This is nothing to go on. I'll be amazed if anyone manages to find anything, but it's a brain worm and it is so annoying I can't find it again!