Because of the mysterious aspect of her, I don’t think they ever wanted an actor to be [associated with Carmen].
And also, how was she…well, I guess that was just a matter of not indicating who the actress played.
Anytime somebody was talking about the international criminal Carmen Sandiego, there is always a question involved across all media, mostly when and where she is in the world, or in the timeline.
But don’t forget, the internet was not [as useful back then].