This is likely a fan-made ROM hack of Paper Mario: The Thousand-Year Door for the Nintendo 64, where Toadette plays a significant role. The details are unknown without more information. The modification may feature Toadette as a playable character, a prominent NPC, or even as the main character, altering the original game's storyline and character interactions.  It is not officially published.

Paper Mario TTYD64 - Toadette

Paper Mario 64 Randomizer (Preset: Open World)