On the way to the refugee camp, why does a woman confront Martina and consequently get kicked off the bus?

A woman named Lara is mad at the Chestnuts because they are taking one whole seat with just the Statue of the Virgin of Guadalupe, and her husband had to be stay behind because there was no more room on the bus. The Chestnuts had taken up unexpected seats when the commander of the troops stationed on Eliza Polk's land granted them passage.