For the Melanie and Jennifer its rng based after you find the ghost and capture it at the Asylum, you need to walk around the map and find any of the Sofas, and the animation can be on either of those, it will be random so prepare for the need to rinse and repeat
Regarding the Judy 1, you need to goto ravens home, find a key, once you have the key go to the university map and use the portal to go back to the past then you can use the key you found on the storage room in the past portal