BURBANK —

The world of JoJo Siwa, the child star who became a pop star who became a TV star, is even smaller than it appears onscreen.

Her homebase, Studio Siwa, is perched on an indiscreet corner in Burbank, California. Next door to a gun store, it’s a bare, black dance studio with a green room that smells like sweaty feet. Curious passersby can easily squint through the tinted windows to catch Siwa, at work in her unglamorous fishbowl.

Siwa holed up there recently with her dancers and team to prepare for a European tour. The other day, while she was scrolling through her phone to play the new track, “I’m Still Dancing,” a survivor’s anthem in the vein of Elton John’s “I’m Still Standing,” something creaked in the cavernous studio.

“We have a ghost,” she said, as her four backup dan

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