It's possible:
* The name is slightly different: Perhaps the spelling is off, or the author uses a different name for their works.
* The author is relatively unknown: There are many talented authors who haven't achieved widespread fame.
* You might be thinking of a different author: Sometimes names get confused.
To help you find the author you're looking for, I need more information. Could you provide:
* Any other details you remember about the author: Their genre, nationality, a specific book title, etc.
* A link to a website or a resource where you saw their name: This would be very helpful in confirming their identity.
With more information, I can hopefully help you find Natalia Rachel Singer's works.