What caused Mae's face to drain all of its color in tuck?

In "Tuck Everlasting," Mae's face drains of color when she realizes that her son, Jesse, has been captured and that their secret about immortality is at risk of being exposed. The fear of losing her family and their way of life overwhelms her, leading to a stark emotional reaction. This moment highlights the deep bond between Mae and her family, as well as the high stakes of their situation.