I'm so sorry, all of this is so scary. The most you can do is stay as safe as you can, you and your mom both, and make sure others know you love them. Don't underestimate the power of a scarf over a mask (depending on how close you get to people) and no guests, not even each other [unless you guys live together ofc]. Hopefully your coworker pulls through. It does look like it takes people down to a 100 from 0 real quick. We've seen it ourselves. One day the patient is up and moving, then the next 3 - they're ventilated or coding. If it helps, there really is no defining pattern to who lives or who dies. Although, inadvertently, that can make things scarier too.. but you have my support. Don't lose your inner strength. Focus on doing right. We can't help losing those we love, but we can try to stay diligent for ourselves and for others. I hope your mom makes sure she is staying safe and is being careful too.
We had a covid (+) patient get sent home 3 weeks post observation, elderly, never so much as exhibited a symptom. Lung cancer original diagnosis, on chemo. The pattern we know of is still very flawed. Nothing is a death sentence, although those you'd never think would die, do succumb. It's fucking weird. Just stay safe man