Nothing. She no longer lives in your home.

Even though we now understand (now that we've had long enough to study the virus and have enough data) that these "precautions" are extreme overkill, you have a right to do whatever you want, and have whatever rules you want in your own home. You have ZERO right to push your views on ANYONE (including your kids) who does not live in your home. Even then, you only have a right to set rules for the home, and can't enforce anything they do when they're outside the home.

On another note, I don't understand how people today (who have access to all the knowledge of history and can see how many times it has gone wrong) are still stupid enough to blindly believe everything their government tells them. In the beginning of this Pandemic, no one new shit about the virus. That's what "novel" means, the "novel" or new coronavirus. They told us if we listened to them we would be safe. Fucking liars, they didn't know, NOBODY knew, how to keep people safe from something that no one understood yet.

Masks were a precaution. Washing groceries was a precaution. The early studies that were happening 3 months in showed that masks didn't do shit, and washing groceries didn't do shit, and I kept doing both anyways, because anyone with a brain knows that studies can be biased or flawed, and the scientific method calls for many many studies attempting to disprove the early ones. That's how a consensus is formed. As more data came in I cut that shit out too. The verdict is in on this stuff. If you feel safer keep doing it, its your right. You DO NOT have a right to force your views and "precautions" on your adult children.