Coworker was in the office with The Sickness. She’s staying home but we’re doing nothing else about it.

So yeah. Small office and we get all get tested on Mondays. The tests are at Coworkers desk. Coworker spent all of Monday in the office and we find out Monday night that she tested positive. We’re all expected back in tomorrow like there’s no risk. Sure she’s staying home but literally everyone in the office was in close quarters with her. My 94 year old grandpa is at my house every night. I’m really not comfortable with the risk.