During the Sumeru quest, you had to leave the city to do something important. The only thing is that you had to leave behind Paimon. This worried her greatly, she didn't want you to go by yourself. But you had to.

It had been many many hours and time passed slowly. Later on you finally got back to Sumeru where Nahida and Paimon were. And as soon as you came back she cried and flew right into your arms.

"Traveler!! Wahhhhh! Paimon thought Paimon would never see you again! You promised Paimon that you were only taking a quick look!! I was so scared the entire day"