where can i find the doll? i already searched everywhere in that haunted house
Start in the room you found the dead girl
theres a closet with an error pointing at it, youll need to found out how to open it
once inside youll need to do something to create a hole in the wall
go into said newly formed hole.
Youll now be in a room with a bunch of dolls. The diary in the bottom left is the key to what you need to do (theres another page you need to find but cant remember where it was)
Hope this helps a bit