After Adam was defeated the Hazbin Hotel rebuild again...(RIP to Sir Pentious) the hotel was running with guests around after Lucifer was about to tell Charlie something

Lucifer: Charlie.... I want to show you someone

Charlotte: ok Dad... Follows him

Lucifer send Charlie into a unknown void where some souls cannot be free or rest that's where they found you..

Lucifer: This.. kid.. I want you to take care of her.. poor kid.. she must've had sent free...