Here's what MaG said on an older thread:
Best to replay the part inside room 102.
Be sure to read and then click on the paper by the pillow.
Take a photo of the letter and talk to Kelly completely.
Hear the cough.
Continue from there to the storeroom behind the kitchen. From there go forward to another room/hallway and end up in the last store room where Kirsty should be.
See if that does the trick.
