“Chilly — cucumber sandwiches — bad teeth. Back in London!”

And on Dec. 20, before the final leg of her trip to Cape Town:

“Going to Africa. Hope I don’t get AIDS. Just kidding. I’m white!”

She chuckled to herself as she pressed send on this last one, then wandered around Heathrow’s international terminal for half an hour, sporadically checking her phone. No one replied, which didn’t surprise her. She had only 170 Twitter followers.