My great-grandmother, 98, uncovers her anxieties, regrets, and things she’s thankful for amid isolation from the pandemic. — My great-grandmother turned toward me, but her focus was somewhere distant. We sat on the stone wall of her raised garden, staring at the 40-foot pine trees towering over her house; they were knee-high when she planted them over half a century ago. The cold, dry weather wrought strong south-west…