Welp, I tried what everyone else said and found the ghost around 2 am. The steps I did was placing NV cameras (like everyone else said) but I also placed the microphones (the green ones, though Idk if it was necessary) in every room occupied by the girls. When I was switching between them in one of the rooms the camera turned red and the ghost girl appeared. I got out of the cameras and clicked in the bottom right corner for the ouija pointer (you have to buy it, it cost $1000). Each pointer can make you ask 2 questions. GL