It's just astonishing, isn't it? Are they just going to leave her to her own devices for 10 days without checking in on her? Can't your sis pre-cook meals and deliver them hot to her and talk to her thru the door or window at least? My heart breaks for all the elderly abandoned and covid-jailed through all this. I hope you live close enough to help or find a good solution. Part of the problem, I think, is in listening to well meaning people talk about it, they actually get mad when someone in their circle gets exposed because now they have to drop everything, run out, get tested and stop all their activities/work for 10 days if they test positive. I am not even sure it is as much about getting sick as it is the stigma of having to call friends, coworkers and family to tell them they might have been exposed. Some people will take it in stride, some will go ballistic on an innocent person trying to do the right thing and inform people.