It's possible:
* The name is slightly different. Double-check the spelling!
* She's a lesser-known actress. It's possible she has worked on smaller projects, indie films, or television shows that haven't received widespread recognition.
* You're thinking of a different person. Sometimes names are similar, and it's easy to get confused!
To help me give you a more accurate answer, could you please provide more context?
* Do you remember any specific films or TV shows she might have been in?
* What genre of film or TV does she usually appear in?
* Is there any other information you can share about her?
With more information, I can hopefully help you find the Leila Johnson you're looking for!