Dartmoor Garden Show

Is there a way to get the Electrocution kill on Lucy Phillips? I know she hangs around the wine barrel for a second, but there are NPCs surrounding that area that immediately clocks if I throw a car battery into the wine puddle (which itself I have to do with a gun, because doing it with a screwdriver also gets me caught).

Since every other target can be take out via electrocution, she seems an odd omission.