When Jade and John were on the ship together, they mentioned going to their own planets for food and other stuff even though the planets were still pocket sized. This to me means Jade was also able to shrink them down to match the size of the planet. So Idk, I feel like she could just-

The whole planet and it'd turn out the same and nobody would even notice. Though this would of course be funny for when people who weren't resized came to Earth C...and they were a fucking ant compared to everyone else T_T like Vriska would've been legitimately fairy sized.