author
Best known for the children's story Rags, this little-documented writer appears in public-domain and audiobook catalogs rather than in extensive biographical sources. The available record suggests a modest publishing footprint centered on a small number of works for younger readers.
Karen Niemann is listed by Project Gutenberg and LibriVox as the author of Rags, and LibriVox describes her as an American author of a short children's book.
Publicly available biographical information is very limited. Reader catalogs such as Goodreads and ManyBooks also connect her name with Rags and a small number of other titles, but they do not provide much verified personal background.
Because reliable sources are sparse, it is hard to say much more with confidence. What can be confirmed is that her work has continued to circulate through public-domain and audiobook libraries, where Rags remains the title most clearly associated with her.