Eleanor H. Porter 
Miss Billy’s Decision [PDF ebook] 

Orphaned as a young woman, Miss Billy has had to struggle to make her way in the world. After finding a place in the family of her late father’s dear friend, William Henshaw, she falls in love with his brother Bertram and helps bring him out of his shell. The two become engaged to be married, and though they are compatible in many ways, Billy begins to fear that she is making a grave error. Will the pair find happiness after all?