Story related, can not be missed.
Solution
*** Spoiler - click to reveal ***While playing as the Best friend, prevent the crash caused by her. To do this, go back to the portrait of the Kid, and change his decision to play with the dog instead (Thus making him cause the crash again). Then, as the Best Friend, go back to the church area and get the rope near the slope. Then, after placing the final box in the truck, tie the boxes down using the rope. Then, drive and end the memory.