Currently it's not. So, currently no problem. If it changes, then it could be, yes. Which is true for any virus. If they change, they could potentially harm lots of people. That's life, and that's why we have the CDC and WHO etc. who keep an eye on things and try to react once that's needed. (Which lots of conspiracy theorists don't like, but that's life too.)
So she never once was at home at 10 am? No weekday, no weekend? Never ever? Never missed gym, never missed church, never had a day off, was never sick?
I call BS. Sorry to say, she may not have been entirely honest with you.
You want to get more conversations by banning conversations? That makes no sense.
We are not machines that convert money (or food/coffee) into code. Social contexts matter, there are personalities behind each face. If you understand the context of your co-workers then it's easier to understand online communication (since most non-verbal communication that happens in person is lost over online channels). Meeting in person sometimes just makes online communication more effective.