sunshineG
the thing is that only you're at risk. Not the rest. So it doesn't make sense for her to stay at home. She's pretty far removed from the source anyway, her son is not even in the same class as that kid. She's not quarantined too, so she's not obliged to take leave just to avoid u and u only.
Well, this virus is here to stay lor. There's no avoiding it unless u wanna take leave and stay at home. Even if it's not her, there'll be others. So let it be. I still think she's being considerate by telling u. U know, she's not obliged to tell u that and u won't even know.
BTW, the authorities want this virus to spread to create herd immunity.