Trude Bruns

Project Gutenberg identifies Trude Bruns as a German-language author who lived from 1880 to 1931. The clearest confirmed work available in the sources is Hans und Suse in der Stadt, a children's novel first published in 1921.

That book follows two siblings, Hans and Suse, as they adjust to life in a busy city after coming from a mountain home. Modern catalog and bookselling pages consistently describe it as a work of children's literature, and its continuing availability through public-domain and reprint editions suggests it has retained a modest afterlife among readers interested in older German juvenile fiction.

Reliable biographical detail beyond those basics is hard to verify from the sources I found, so it is best to treat her as an obscure author whose reputation rests chiefly on this surviving children's book rather than on a widely documented literary career.