* A local or lesser-known artist: She could be a singer in a specific region or genre that hasn't gained mainstream fame.
* Using a stage name: Perhaps her real name is different, and she's performing under Roberta Lee.
* A misremembered name: It's possible you're thinking of a different singer with a similar name.
To help you find out more, could you provide any additional information, such as:
* What genre of music does she sing?
* Where did you hear about her?
* Do you know anything else about her, like her age or where she's from?
With more details, it might be easier to identify the singer you're looking for.