"Did the Ringmaster even go out into the worlds where we had less magic? I saw her out and about in Atlantis and know she was out and about during the Celebration, but did she explore the Mainframe or just stay back in the Carnival?"

Because that's the interesting part. No matter what world the Ringmaster linked the Carnival to, it still remained a beacon of magic. And did the magic of the Carnival override the lack of magic in some of the worlds they arrived at? Hell if Strange knew.