Can her husband not commit her? Geesh! You, as a neighbour who lives there, need to call the cops and tell them you are afraid and WHY. They need to hear from others besides the family and that sick woman. They also need to know that you are on medical leave (or whatever that is), and that this woman poses a danger to your health and well-being. You call the police when YOU are in danger.

I don't know WHY the hospital would listen to her scream threats and decide to release her after a few days. Unless they've taught her husband how to cram medication down her throat.

Start looking for a home and call the police.