Once again I don't remember half of the story. But the main points are:
- one of the main characters is rich. She had a very rocky relationship with her mother, who recently died. She hires a cleaning service for her house.
- second character is the one who comes to clean the house. But the cleaning company in fact belongs to her parents.
She has a small child (I think it was a little girl), and she takes the child with her to the house.
While cleaning the house she finds boxes with things that belonged to the first characters mother. I think there was a diary, that showed the the mother in reality was really proud of her daughter and loved her very much, or something like that.
- by the end of the story someone ends up in a hospital (maybe the child). And both women are waiting in the hospital wing, when the first character suggests that she will find a burger for the other one to eat. (I know, I know... It is an odd thing to remember from the whole story

Well that's all that I remember. If someone could decipher this puzzle I would greatly appreciate the help! I've been searching for this story for a year now.