Wilhelm Ritter von Wymetal interprets D&C 132:55 as allowing Joseph to divorce and care for Emma.
Wilhelm Wymetal, Mormon Portraits or the Truth About the Mormon Leaders, Volume First: Joseph Smith the Prophet, His Family and Friends (Salt Lake City: Tribune Printing and Publishing Company, 1886), 108
21. And I command mine handmaid, Emma Smith, to abide and cleave unto my servant Joseph, and to none else. But if she will not abide this commandment, she shall be destroyed, saith the Lord, for I am the Lord thy God, and will destroy her if she abide not in my law; but if she will not abide this commandment, then shall my servant Joseph do all things for her, even as he hath said,‡ and I will bless him and multiply him, and give to him a hundred-fold in this world, of fathers and mothers,§ brothers and sisters, houses and lands, wives and children, and crowns of eternal lives in the eternal worlds. And again, verily I say, let mine handmaid forgive my servant Joseph HIS TRESPASSES, and then shall she be forgiven her trespasses, wherein she has trespassed against me, and I, the Lord thy God, will bless her and multiply her and make her heart to rejoice.
‡That means, I suppose, put her away and provide for her.
§-in-law?