Why does it say "Ish ha'Ishah ha'Nirtzechah"?
Malbim: She was married (a Pilegesh has Kidushin - refer to 8:31:1:1,2 and the notes there), and she was not Mezanah (refer to 19:2:1:1-4), so she was permitted to him. She was murdered; she did not die from the cold.