[oldalum]

  Fomites on the grocery bags or groceries or the packages she picked up seem as likely as "from a distance".

yes, it seems more likely to me: infectious person carries bags by their handles up to the front door; minutes later, the woman picks the bags up by the handles with bare hands, no indication that she washed her hands immediately after this. She didn't have to touch her directly. (the alternative is scarier, that the deliverer produced an aerosol above the bags that lingered and the woman breathed in when she picked them up.)  The irony is that she wore gloves to bring in the mail every few days, which I think is a much lower risk type of exposure. 

Whenever I come into the house after a trip or handling dropped-off packages, the first thing I do is hand wash. It's very hard to keep all surfaces uncontaminated, but the hands are the key end transmitter.

[oldalum]

  Fomites on the grocery bags or groceries or the packages she picked up seem as likely as "from a distance".

yes, it seems more likely to me: infectious person carries bags by their handles up to the front door; minutes later, the woman picks the bags up by the handles with bare hands, no indication that she washed her hands immediately after this. She didn't have to touch her directly. (the alternative is scarier, that the deliverer produced an aerosol above the bags that lingered and the woman breathed in when she picked them up.)  The irony is that she wore gloves to bring in the mail every few days, which I think is a much lower risk type of exposure. 

Whenever I come into the house after a trip or handling dropped-off packages, the first thing I do is hand wash. It's very hard to keep all surfaces uncontaminated, but the hands are the key end transmitter.