A quick breakdown of what we know about the Bee: she's had a "long career" and never wanted to stop doing what she loves; she says the nickname "Empress" suits her; she wants to sing for "a whole new generation," since she first started singing "in the '50s." Her clues also included a photo of tennis balls!
So, who could it be? I mean, it has to be Gladys Knight, right?! It sounds just like her.