You guys live together right? if I remember correctly your dealing with health issues that has you at high risk.. Her driving around? going to her kids house? There is a Pandemic, I would not blame someone for not opening the door...

And if there is a history of abuse ...Yes her talking about killing herself to her children is abusive, they suffered trauma.. I think you have mentioned shes abusive towards you, Her yelling and demanding is abuse.

Honestly due to your health problems there should be only one person leaving your home to go get food, meds and supplies. And it should be you, as she is not thinking about anyone else...

Is there anywhere you can go to get away from her? move in with a family member or friend??? I commend you on your ability to stay to help take care of her but there are limits and shes crossing them.

I dont know if you have children of your own but any loved one in your life, consider what advice you would give them if they were with someone like her??

Stay safe