Don't what to say to you Boogie except I am praying for you all. What a situation to be in

I am totally convinced I shall spend years in a state of wide-eyed PTSD about what we go through during CoVID.
You are absolutely right that there is nothing you can do but watch events unfold in all their sheer horribleness. Expect your beloved to dysregulate more than usual, as who wouldn't, and hold on to your temper. I have often found that being silent and just being there is all that is needed. And then life boils down to sheer admin in the end. Make sure that your own little corner of the family is secure and can weather the storms to come. You can't protect others from their own dysfunction.
I totally hear what you are saying. My pwBPD inspires me all the time, I see what she is up against and how hard she works to overcome. It humbles me.