Missionary wives sometimes become a “missionary wife” without much warning. Their husband who is working in another ministry or as a laymen, suddenly surrenders to be a missionary. He notifies his wife and by default she assumes the role of “missionary wife”.
Because of this, a missionary wife can have very little training or understanding of her role. There is a good chance she didn’t go to Bible College, but if she did, probably didn’t take many missions classes.
She can also enter her role without having a solid foundation on Biblical Womanhood. Without this foundation, she may be confused to what her role is according to scripture and how to apply herself when she arrives on the field.
So let’s first consider the basic understanding of what Biblical Womanhood is. I agree with the following author when he writes:
“that God created man and woman equal in value and personhood, and equal in bearing his image, but that both creation and redemption indicate some distinct roles for men and women in marriage and in the church.” 
Let’s make sure we understand two terms from the quote above:
Man and Woman are created equal in the sight of God (Genesis 1:27; 5:1–2). This is to say that neither gender is more or less important or valuable. Both men and women can equally serve, love and worship God. We are redeemed the same way and in Jesus Christ we are one (Galatians 3:27-28).
Equality means equal in importance and value but it doesn’t mean having the same roles, such as in marriage and ministry. As God has authority over Christ, so the husband has authority over his wife (1 Corinthians 11:3). Woman’s creation was so that she could be a help meet to man. (Genesis 2:18; 1 Corinthians 11:9). In creating man first, God set in order that man is the head. We also see this bear witness in the church, men are to be the only ones who hold the office of a pastor or the positions of authority and teaching over the church (1 Timothy 2:11-14; 1 Corinthians 14:33-36). But even in our different roles, there is a unity between the man and woman (1 Corinthians 11:11-12).
Now that we have this as a basis, we will next look at what the Bible has to say about a woman’s role specifically.