It's possible:
* You might be thinking of a different actress with a similar name. There are many actresses who have names that sound similar to Nancy Karr, such as Nancy Cartwright, Nancy Allen, or even just a different spelling of Karr.
* The actress you are thinking of may have a different stage name.
* The actress might be a relatively unknown actor with limited credits.
Could you please provide any additional information about the actress you are looking for? For example:
* What type of films or shows do they typically appear in?
* What is their approximate age?
* Are there any other details you remember about them?
With more information, I may be able to help you find the correct actress.