why didn't she just run away as soon as she was brought outside?

She explained that some victims don't run away after being raped because they feel worthless, especially if they have been raised in conservative religious cultures that push abstinence-only education and emphasize sexual purity:

Smart said she “felt so dirty and so filthy” after she was raped by her captor, and she understands why someone wouldn’t run “because of that alone.”

Smart spoke at a Johns Hopkins human trafficking forum, saying she was raised in a religious household and recalled a school teacher who spoke once about abstinence and compared sex to chewing gum.

“I thought, ‘Oh, my gosh, I’m that chewed up piece of gum, nobody re-chews a piece of gum, you throw it away.’ And that’s how easy it is to feel like you no longer have worth, you no longer have value,” Smart said. “Why would it even be worth screaming out? Why would it even make a difference if you are rescued? Your life still has no value.”

Since her rescue, Smart created the Elizabeth Smart Foundation to bring awareness to predatory child crimes and speaks about her own experience.

Smart says children should be educated that "you will always have value and nothing can change that."