Julie knows the exit? ? ?, Reivew on The Descent: Part 2

I watched the first part in the introduction of CCTV, and after waiting for nearly a year, the second part came out. Still bloody and violent. I won't write a review, just a little doubt. After the group met Julie, Julie said, I know the exit, come with me... I feel very puzzled. I don't know if it's a translation problem or the original words are just like this. If Julie knew the exit, why didn't she run away? Have to wait for Sarah and her party to escape together? Did she know that Sarah and the others would come to her rescue?

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