I think she dozed off at the diner... had the Utopia dream... then woke up when her pancakes arrived. We see the bulletin board with the chicken piccata recipe and the doll fair flyer, which was part of her dream. Another odd thing was that she ran out of gas despite having stopped at the truck stop where she, presumably, refilled. Also, there wasn't a road next to the Camp Utopia sign... it was just a sign on the side of the road. That might not really mean anything, but I just found it odd.
When things kinda seem odd, it could indicate that she was dreaming.
Anyway, she ordered her pancakes, dozed off... had her dream... woke up when her pancakes arrived... noticed her SUV in the parking lot (still thinking Linda was there)... goes outside... then gets taken out by that truck accident.