You did what you had to do, for your safety, hers, and your other coworkers. I don't know her financial situation but going to work while potentially infected with COVID is unacceptable.

Snitches get stitches ... or the delta variant.

Snitch

so you could get the silent treatment, or COVID...easy choice. you did the right thing, if she's going to be a stubborn little brat, oh well.

Screw her

Lol so many comments are getting downvoted for talking about doing the right thing. All the coworker had to do was get tested. It’s free. She’s not even in trouble at work. Coworker is the asshole here. Period point blank. OP did the right thing. What would be your stance if they were working in a kitchen and the coworker had a cut on their finger handling food without gloves or something? There is no ambiguity here. It’s about health and safety. Why the fuck is this so hard for so many people? You’re all fucking dicks, man.

you people disgust me

...I don't see the problem.