The Grocery Boy: Genre Undetermined

The pruning was overdue and the garden was thick and wild, tangles of thorns and vines wrapping around the fruit trees, weeds crowding out the tulips, peonies rotting over the delicate violets planted at their base. It had been three years since she'd stepped outside her house, and she had not minded the decaying, wild overgrowth. She had rather liked watching it take over the backyard. It was alive and flourishing. At least there was something that was. She had stayed inside, moving through dimming dust-covered windows, wearing old patched clothes as hers gradually wore through, eating the supplies that the grocery brought her or that were in her pantry. The grocery boy had not come this week, and she--

Inspiration: Postponing my own gardening.
Story Potential: High.
Notes: The question is, did something bad happen to the delivery boy? Or the grocery? Or the town? Or civilization as she knows it? I really, really like this set-up, but I'm greatly amused that it could go from cozy mystery to post-apocalyptica quite easily.