I just finished Ghost in the Little House - the story of Laura's daughter, Rose, and her significant contribution to the Little House books. Rose and Laura had a very difficult relationship, and Rose blamed a lot of their problems on the 'hardness' that Laura developed as a result of her early days of deprivation. For instance, Rose had terrible dental problems (infected/abcessed teeth) that she felt were a result of poor nutrition as a child - it was years before Laura and Almanzo were financially secure, and much of Rose's youth was spent in poverty.
The book The First Four Years was not edited by Rose, and the difference is obvious. It was written for adults, and Laura's description of her labor and delivery of Rose had to be cut almost entirely from the book, as it was much too graphic for children. There's also a line about Laura suffering miserably from morning sickness during her second pregnancy, and she thinks 'grimly' to herself, 'Those who dance must pay the piper'. I was re-reading the book as an adult before the meaning of that line really sank in!