Visible crew/equipment: When the two lead characters pull up to a stop in the car, the shot is dead-on from the driver's side, and you can clearly see the entire camera crew reflected in the side of the car. (00:30:10)
Visible crew/equipment: The gas attendant check his garage because he hears a noise. After he has investigated, he walks back over to his red truck. As he walks over, you can see a boom mike moving around, reflected in the red truck's windsheild. (00:30:55)
Visible crew/equipment: When the gas station attendant is talking out loud to himself after giving directions to the people, there is a shot of him through a window, in the window you can clearly see a crew member. (00:29:20)
Chosen answer: Who knows? Maybe they blackmailed her, because she works there, and the children wouldn't get caught poisoning the coffee, or maybe she isn't as old as you think, she could well be in her mid 20's, it's hard to tell, you only see her briefly.
Hamster ★
She is obviously in her late teens, early 20s.