Lie to make her comfortable

"So. It's all going to be okay." You smile, not even wanting to read the plaque for fear of what it says. "What's your name?"

"Isabelle," she says, squirming a bit.

"Right: Isabelle, you're going to be okay, I just need to get something from upstairs to unlock you. It takes some time, so I'll do it as soon as I finish with all the urgent guests. For now, please," you turn to her friend, "take care of her and I'll be back in just a moment."

Her friend giggles and says, "Sure."

The lack of sincerity makes you and the girl uncomfortable but you don't have time to sort out their issues.

Flash.

The girl giggles again behind you.

"I swear to god if you take one more photo of me while I'm stuck here I'm going to kill you!"