From the Super Mario Wiki
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“I heard the hole in the sky was created by Count Bleck to destroy the world! And this Bleck guy hangs out with a foxy secretary type named Nastasia... So I wonder what's up between them... And I hear this Nastasia is a hypnotist, but her powers don't work one the count! Ladies need to watch out for men that are impervious to their feminine wiles...”
Sipsi is a resident of Yold Town in Super Paper Mario. She's known as the "town gossip" and she's always the first to know anything that happens in town. She gives info about flipping dimensions when the player sees a row of coins. If the player talks to her after completing other chapters, they can hear her gossip about various other characters in the game.