They see her. They've got to be seeing her. There's no other reason for one pair of feet to be following her slow movement down the river. "Hello? Can you hear me?"

After a moment of consideration, she jams her shoulder hard into the side of the bottle. Despite the pain, her bottle does change direction slightly, heading towards some steps that lead straight into the river. For now, the current isn't pulling her too quickly, so whoever it is can easily lean over and pick her up. Hopefully.