Books by Jean Ure
The parents of a girl take on a series of short- and long-term foster children.
A matter-of-fact series dealing with the various problems of fostering children
Cosy (short for Cosima) finds herself getting used to a foster family just as she is starting at the school to which she's earned a scholarship.
Even if one were to extract the subplot of the ghost girl -- which is reminiscent of Charlotte Sometimes -- the story has a gently courageous feel: Cosy struggles hard because her Father's dead and she and her ill mother have kept each other going for years. At one point she gives in -- all her mother's efforts have only landed her in hospital -- but one of her foster sisters cajoles her roughly out of her mood and she goes on to make a good friend and do well at school.