https://www.deutsche-biographie.de/pnd118616455.html

The Swiss author was born in the canton of Zürich. She is best known for her children’s stories - notably Heidi, which she wrote in four weeks. As a child she spent several summers near Chur in Graubünden, which became the setting for her novels. www.weforum.org

Johanna Louise Spyri (née Heusser; German: [jo%CB%88hana ˈʃpiːri]; 12 June 1827 – 7 July 1901) was a Swiss-born author of novels, notably children's stories, and is best known for her book Heidi. Born in Hirzel, a rural area in the canton of Zurich, Switzerland, as a child she spent several summers near Chur in Graubünden, the setting she later would use in her novels. - https://en.wikipedia.org/wiki/Johanna_Spyri