Is it permissible for a veiled woman to remove her veil to wrap it around a child suffering from severe bleeding, even if her hair becomes exposed to people?

A woman must wear a headscarf in front of non-mahram men, and it is not permissible for her to remove it except out of necessity. If it becomes necessary to remove her head covering to save a child, stop his bleeding, and rescue him from death, then she must do so, even though it is unlikely that there would be no other means to save him without removing the headscarf.