I’m looking for a young adult book about:

Young mother with 2 girls, they lost their house to a fire, and therefore lost everything including their dolls and toys. I remember these phrases “Maybe a mouse in a box of matches”, and “I’ve got both my girls.”  They stay with relatives/friends and the girls have to sleep on an old sofa that due to the springs it is uncomfortable and creaks.

The mom finds a job as a cleaner in a motel/hotel.  They find a new home.  Outside their new home is a crab apple tree where the girls play catch with an apple. Somebody tells them about a place where they can borrow dolls and if they take good care of the dolls, they can adopt them.  They walk with their mom to find this place. Just when they are about to give up, they find it.  

The younger girl finds a doll and names it “Baby.”  Both girls are happy and one of them says “There is so much to do now”.  The mother sews the dolls new clothes and the girls are happy. However, a neighbors dog licks off the face of “Baby” and the younger girl runs back to the place where she borrowed it from to return the doll, knowing she won’t be able to adopt it.

So, now she won’t be able to join her sister in the adoption party. At the end of the story, the doll “Baby” is returned to the younger girl, all fixed up with a new face.  The man said because the younger girl showed responsibility with the doll by immediately bringing it back to the place where she picked it out, she is allowed to adopt it. This happened at the very end of the adoption party.