I'm trying to find a YA book set in 30s/40s London, about a girl named Marjorie or Mollie, she had a dog called Buller, and a best friend named Keziah who was Jewish. She has no mother and was sent to live with family (an aunt I think?) Who is casually quite cruel to her emotionally. I wish I could remember title and author.
I seem to recall it was maybe published by Lions teen tracks...