According to the text in Chapter 16 of the book, how is Penny distracted to the point that she injures her arm while putting the laundry through the wringer of the washing machine in Nonny's basement?

According to the text in Chapter 16 of the book, Penny is distracted to the point that she injures her arm while putting the laundry through the wringer of the washing machine in Nonny's basement, because she is thinking about a fight that she has had with Me-me, rather than paying attention to what she is doing.