She grabbed my arm in a dark room—was she scared or into me?

During a trip, a girl and her friend actively chose to separate from a crowd of 60 students just to walk with me. While exploring an abandoned building, we went into a dark room. She got spooked and instantly grabbed my arm tightly for protection, ignoring everyone else, including her best friend.
Girls, would you do this to a guy you don't like, or is she interested in me?
She grabbed my arm in a dark room—was she scared or into me?
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