Little House books ghostwritten?

As a kid, I read many of Laura Ingalls Wilder's Little House books so I was interested to read that Laura's daughter Rose may have co-authored them.

Wilder scholarship is a flourishing industry, particularly at universities in the Midwest, and much of it seeks to sift fiction from history. The best book among many good, if more pedestrian, ones, "The Ghost in the Little House," by William Holtz, a professor emeritus of English at the University of Missouri, explores a controversy that first arose after Wilder bequeathed her original manuscripts to libraries in Detroit and California. It is the work of a fastidious stylist, and, in its way, a minor masterpiece of insight and research. Holtz's subject, however, isn't Laura Ingalls Wilder. It is her daughter and, he argues, her unacknowledged "ghost," Rose Wilder Lane.

Rose was an interesting character; she escaped the prairie life of her parents and transformed into a "a stylish cosmopolite who acquired several languages, enjoyed smoking and fornication, and dined at La Rotonde when she wasn't motoring around Europe in her Model T".