The enchanted barn | 
The idea is that a poor family does a makeover on a barn to live in. Probably a new idea in the early 1900's. Makeovers of any kind are catnip to me. This is my mother's favorite of Hill's books so I'm giving it a try.
Everyone in the Hollister family is so earnest. And the mother and youngest daughter are very ill and their apartment sounds ghastly. It's up to the heroine Shirley to save them.
P. S. Mary Pickford image.