My little sister has started wearing diapers recently.

Recently, my little sister has been acting strange. Until a little while ago, she would dress nicely, hang out with friends, and had a boyfriend. But now, except when she goes to school, she just stays home all the time, glued to the internet. Concerned about this, one day I asked my sister if something had happened. "Oh, big brother. If you wear diapers, you don't have to go to the bathroom!" — What the hell is she talking about?