Help with my 6 yo got scared at 8 pm still wont sleep!?

my daughter thought there was a ghost in her room at about 8 toninght. It was really just her daddys shaddow, the wind from the door opening, and the door creaking as he came in the house. i have tried for hours now to get her to go back to sleep! i let her get up and we cuddled for a while and i explained what she heard and saw. nope. we ghost hunted the entire house. nope. daddy re enacted coming in the door to show her it was just him. nope. i let her little sister lay with her. nope. she cant sleep in our bed because her dad has to go to work early, so i made her (and little sissy) a pallet in the living room and the kid still wont sleep! if i move or make a noise she flips out, im exhausted! ~i have a new baby too 5 weeks. i just want to get some rest any ideas!