* The name is misspelled. There might be a similar name, like "Isabelle Chopin" with a different spelling.
* The author is not well-known. They may be a self-published author or write in a specific genre or language that hasn't reached wider recognition.
* The author uses a pen name. It's possible they use a different name for their publications.
Could you provide more information about what you are looking for? For example, what genre does Isabelle Chopin write in, or are there any specific titles you are interested in? This could help me narrow down the search and find the correct author.