Abraham 2

Abraham writes that -

"...when I was come near to enter into Egypt, the Lord said unto me: Behold, Sarai, thy wife, is a very fair woman to look upon;
23 Therefore it shall come to pass, when the Egyptians shall see her, they will say—She is his wife; and they will kill you, but they will save her alive; therefore see that ye do on this wise:
24 Let her say unto the Egyptians, she is thy sister, and thy soul shall live.
25 And it came to pass that I, Abraham, told Sarai, my wife, all that the Lord had said unto me—Therefore say unto them, I pray thee, thou art my sister, that it may be well with me for thy sake, and my soul shall live because of thee." (Pearl of Great Price Abraham 2:22 - 25)

One can infer from these words that Sarai did just that in that they were both spared. My understanding is that Sarah was a sister and this wasn't a lie. Just as Abraham, Sarai must have also been a valiant and obedient individual. I personally appreciate the teaching of Elder Bruce R. McConkie -

"The Lord never sends apostles and prophets and righteous men to minister to his people without placing women of like spiritual stature at their sides. Adam stands as the great high priest, under Christ, to rule as a natural patriarch over all men of all ages, but he cannot rule alone; Eve, his wife, rules at his side, having like caliber and attainments to his own. Abraham is tested as few men have been when the Lord commands him to offer Isaac upon the altar (Gen. 22:1–19); and Sarah struggles with like problems when the Lord directs that she withhold from the Egyptians her status as Abraham’s wife. . . . And so it goes, in all dispensations and at all times when there are holy men there are also holy women. Neither stands alone before the Lord. The exaltation of the one is dependent upon that of the other." (Doctrinal New Testament Commentary, 3:302)