The deceased could have very easily told the discharge planner that she had a place to go.  It's not up to a discharge planner to handhold people that leave the hospital.  Matter of fact, I intervened with an individual that collapsed two times at a local library.  It turned out the individual was homeless and taken by ambulance to ER.  The individual wound up staying in the hospital for seven days.  Two social workers tried in vain to transition the individual to a safe place, but the individual refused help outside the hospital.  What do you do with that type of character?