Mimicker

Caroline's mom recommended a camp for her and her friends. Her mom highly suggests Woodlake Camp for Caroline and her friends because of the non-existent socialness they have. Her mom wants her to make more friends because Caroline's been stuck to the same friend group since kindergarten.

Everything is perfect at the camp. There are butterflies, sunrise shines through dorm room windows, there's a princess-like gazebo. There could not be a camp prettier. The main activities held at Woodlake Camp are board games, digital games, truth or dare, kiss marry kill, and there is one activity that really sticks out to Caroline.
The maze.

After Caroline and her friends hear one of the camp's counsellors announce that the maze is going to be starting, Caroline has an uneasy feeling. Her friends, Ivy, Willow, and Addison sense it too. They always think the best of things, so it wears off of them quicker. Caroline has stuck with her friend group all night, but she keeps seeing them everywhere that they were not. Nerve and fear overcome her when they all split off and enter the maze.

Only one person out of everyone in the camp leaves. Who is it?