I think I understand what was happening to her. When we talk about home today, we mean just our four walls and (if we’re lucky) our nuclear family. But that’s never been what home has meant to any humans before us. To them, it meant a community—a dense web of people all around us, a tribe. But that is largely gone. Our sense of home has shriveled so far and so fast it no longer meets our need for a sense of belonging. So we are homesick even when we are at home.