Is the prayer valid if some hair protrudes in the form of thorns from behind the head covering?

Concealing the 'awrah (intimate parts) is a condition for the validity of prayer. A woman's hair is considered 'awrah. If a few strands of her hair become uncovered during prayer, her prayer is not invalidated because the uncovering of a small amount of the 'awrah is excused. However, if a large amount of hair is uncovered, then if she realized it after the prayer or covered it immediately, her prayer is valid. But if she realized it and left it uncovered, her prayer is nullified.