Final answer:
The question seems to mistakenly reference Kate Chopin; however, it was Rosa Bonheur who had a close 10-year relationship with American painter Anna Klumpke, marked by significant personal and professional collaboration.
Step-by-step explanation:
The individual that Kate Chopin had a 10-year relationship with was not Kate Chopin herself, as the provided information pertains to Chopin's life and work. The referenced relationship appears to be between Rosa Bonheur, a noted French artist, and Anna Klumpke, an American painter. They communicated by letter for ten years, and following their meeting, they shared a close personal and professional relationship with one another. Bonheur and Klumpke were significant figures in the art community, with Klumpke ultimately inheriting Bonheur's estate and honoring her legacy through the establishment of an art school and museum, as well as authoring a biography of Bonheur's life.
Kate Chopin had a 10-year relationship with a woman named Klumpke. Klumpke communicated with Chopin for ten years through letters before meeting her in person. After their meeting, they developed a close relationship, and Klumpke moved in with Chopin. They entered into a formal contract and Klumpke painted portraits of Chopin and wrote her biography. After Chopin's death, Klumpke inherited her estate.