Voici le passage concerné :
"Therefore when Nienna came to him and renewed her prayer for Míriel, he consented, accepting the abnegation of Finwë as her ransom. Then the fëa of Míriel was released and came before Manwë and received his blessing; and she went then to Lorien and re-entered her body, and awoke again, as one that cometh out of a deep sleep; and she arose and her body was refreshed. But after she had stood in the twilight of Lorien a long while in thought, remembering her former life, and all the tidings that she had learned, her heart was still sad, and she had no desire to return to her own people. Therefore she went to the doors of the House of Vairë and prayed to be admitted; and this prayer was granted, although in that House none of the Living dwelt nor have others ever entered it in the body. But Míriel was accepted by Vaire and became her chief handmaid"
HoME X, Later Quenta Silmarillion, "Of the severance of marriage"