Dead girls dont write letters

okay so i have been reading this book and its about how a girl dies in a fire. She lived in the apartements but there was never any proof or residue of her so they assume she is dead. The family soon recieves a letter saying that she is not dead ! and that she is coming home! The letter is just like jazz! the same smell, color pen, stationary,handwritting! everything is just like her! The next day when she shows up it is not her! she looks like her but its deffinatly not her! The family goes in shock ! but she knows everything were everyhting in the house is things that happend in the pass! She insist that she changed but its still her..............