The Luckiest Girl in all of Kansas

As she looked across the devastated landscape, Dorothy couldn't understand why her aunt and uncle kept acting as if they'd won the lottery, instead of losing everything they owned.

Aunt Em kept saying that the important thing was that they were all okay. If they'd closed the storm doors any sooner, or if she'd come home just a minute later, Dorothy would've had nowhere else to go but the doomed farmhouse, and she would've ended up... who-knows-where, probably scattered across the countryside with the rest of their possessions.

Still, if she was so lucky, why did she feel strangely homesick?