The girl's name is Rivka.
From the text:
"You must take good care of your bowl," the girl said to them. It was obvious she had recited these same words to each group of newcomers, yet her voice held a sweetness and a patience quite out of keeping with the information she delivered. "I call them Every Bowls because they are everything to us, Without the bowl, you cannot have food, you cannot wash, you cannot drink. Memorize your bowl—its dents, its shape. Always know where you have put it. There are no replacements."
The Devil's Arithmetic
Rivka, you do everything, wash, eat, go to the bathroom on it.
