Emily D. P. Young says that Emma Smith knew about plural marriage and was "bitter" and "unpleasant" about it.
Emily D. Partridge Young, “Testimony that Cannot be Refuted,” Woman’s Exponent, 12, April 1, 1884, 165
Emma was a witness to Joseph taking plural wives, on one occassion at least, and if she has denied it on her death bed (which is very hard to believe) even forty times over, it does not destroy the facts. . . .Emma seemed to feel well until the ceremony was over, when, almost before she could draw a second breath, she turned, and was more bitter in her feelings than ever before, if possible. She had, as it were, bound us to the ship and carried us to the mid ocean, then threw us over board to sink or swim, as the case might be.
She often made things very unpleasant, but I have nothing in my heart towards her but pity. I know it was hard for Emma, and any women to enter plural marriage in those days, and I do not know as anybody would have done any better than Emma did under the circumstances.