From the Super Mario Wiki
Mini Rosalina is a wind-up toy based on Rosalina that appears in Mini Mario & Friends: amiibo Challenge. It becomes playable when the player uses Rosalina's compatible amiibo. Just like the other playable toys in the game, Mini Rosalina has a special ability that only it can perform; its jump, called the Lunar Launch, allows it to reach high areas. Similarly to the other new mini characters in the game, the character that Mini Rosalina is based on does not appear in the Mario vs. Donkey Kong series at all.