Rainforest
Acacia wakes when she hears the beast moving, and stays in her tree perch to watch. Her plan is to wait for it to get entangled in snares before she closes. Even so, the snares aren't likely to pin down such a massive beast for long, so it'll be a challenge. Her best hope is for it to break an ankle in one of the holes she dug, but a twist or sprain (or missing the holes altogether) is more likely.