Edit: Children comments are pointing out the antibiotics could be for secondary infections. Fair enough, but the parent comment's implication that the antibiotics helped with coronavirus recovery is what's problematic.
It's a rough equivalent of disinfecting a wound and putting a band-aid on it. Better than nothing, but doesn't address the issue directly.
Calling it Corona is just my speculation based on who she worked with in the clinic where she's a nurse.
I asked her again, now it's confirmed it's Coronavirus. It takes time to get lab test, they can't confirm it immediately it seems for now.
They're doing a labtest for Coronavirus because she's been in contact with a nurse who's been in contact with a Coronavirus patient. It is just standard protocol to get tested in that case.