Your sister lost her first tooth. All four are wiggly, and the bottom one came out first. She had made her own water popsicles, and while chewing on one, dislodged the tooth. And it didn't hurt. She was mostly worried about the blood.
She carried her tooth to school the next day to show her teacher and classmates, in a baggie, and came home with a red tooth box from her teacher.
The Tooth Fairy