An endless journey of escape ~I'd die for my father-in-law... ~ Nana Aida JUX-304

Earlier today, Nana, an unconscious woman, was found at the hotel. A forensic examination revealed traces of sleeping pills in her system and ligature marks on her neck. Later, outside a nearby building, the body of a man was found hanged; the two were identified as the father-in-law and eldest son's wife. Police stated they have preliminary investigation results, but why did Nana not resist? What is the truth behind this incident?