Yes, she shows them her undies

Alexa walked over to the laundry room and reluctantly retrieved her undies from the hamper and carried them over to the girls. She held out her undies and they all looked. “Oh my,” Megan said. “You really did soak these. And look there are brown stains at the back. This is disgusting, Lexi. You really do belong in diapers.”

“You had an accident during our games?” Heather said. “Why didn’t you just ask to go potty? Or just go to the toilet?”

Alexa blushed. “Look these are really stained,” Zoe said. “And not just from the current accident. These are old potty stains. It seems that someone lied about not wetting the bed. Because if she wets her pants this much, there’s no way she goes a day dry when she’s asleep.”

“Well, Lexi?” Alice asked. “Tell us the truth. The honest truth. When was the last time you wet the bed or wet a diaper that you went to bed in?”

“Yes, tell us the truth,” Megan said.

Alexa’s bottom lip quivered. “Y-yesterday,” Alexa whispered.

“Excuse me? Full sentence,” Megan said.

“The last time I wet the bed was yesterday,” Alexa said.

“Which means you blatantly lied,” Alice said. “You lied to us Lexi. You’ve only said truths all night, and only did one dare, and yet apparently you didn’t even tell us the truth.”

“It sounds like Lexi has been very very naughty,” Heather said. “What should we do about that?”