Once you gain control of Abby, follow the path down until you go under a log, then take a right and head into the Gazebo to find an Artefact 81/117. Make your way into the building on the left and then throw a bottle at a small window, now crawl through and interact with the bin to find a Coin 1/32.
Place the bin against the wall and climb up, now run along the roof and drop down to the right to view a scene.
After the scene, follow Dad until you see some tracks, inspect them by pressing [Triangle], then look to your left and show your Dad the blood on the floor. Now follow him through the fence and a cutscene will playout.
Finally, head down the corridor and go through the red door for another scene.