Judging from the nearness of the sound, she could not make it up the hill to Janet's Farm in time to get inside. Even if ahe could get inside in time, she would be trapped. But across the pond, there was a thick redwood forest that would be difficult for The Machines to immediately penetrate.
Acording to the map, just below the pond, a faint trail on a narrow ridge crossed the swamp in the direction of the woods. If she could reach the forest ahead of the machines, she might be able to make it to the lake by picking her way through the woods.