DUBAI, United Arab Emirates – Saudi Arabia appointed its first female ambassador early Sunday to serve as its top diplomat in the United States, pulling a son of King Salman back to the kingdom to serve as deputy defense minister amid deteriorating ties with America after the killing of Jamal Khashoggi. Princess Reema bint Bandar Al Saud, a daughter of the kingdom's longtime ambassador to Washington Bandar bin Sultan Al Saud, faces a stark challenge in improving ties between the U.S. and Saudi Arabia.