I want to say the triggers would be dub-con and power imbalance due to the nature of the relationship/how it gets set up in the situation.
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Anna knew she messed up, or how her panicked mind stated it in the moment, fucked up horribly, the moment she felt the loose soil slide beneath her boots. Obviously hiking off any marked pathways was a terrible idea in general, but even more so when no one knew the area you decided to explore while going camping alone.
So she really shouldn't have decided to come out here after her friends bailed on their group trip. Should have really known the course of events would take a turn for the worst with her luck as of late, but no, she just really wanted to go camping this specific weekend. And now, here she was, doing a mix of free falling and tumbling down the side of a mountain, like the idiot she could be at times.
Really Anna should have known better, especially seeing as how, not 5 minutes ago, her cell had no reception. So yes, she was in the worst pickle of her life, and very much hoped that life would still be intact once she stopped falling.
Not even a minute later, she managed to hit the side of a tree, slowing her descent, but flipping her so that the next stump she smacked into knocked her out. The next thing Anna knew, was that she was somehow still alive, and at the very bottom of the mountain.
Now she just had to figure out how to find her way out of what looked like a forested area.