Transgender Before And After.
Just know that she has been indoctrinated to believe that she wont reach the highest level of heaven if she isn't married in a Mormon temple to another Mormon. If she had to choose one issue to dedicate her life to, it would be gender equality.
Unless you convert she won't marry you, plain and simple. She is going on a mission which means she is heavily invested in performing according to the cultural expectations.
His superiors will determine when he takes time off. Nothing less will do.