First I need to address the suggestion that the Bride "making herself ready" contradicts the Doctrine of Grace if she's The Church. Since I firmly believe in Justification by Faith Alone, that we're saved by Grace through Faith. And also in Eternal Security.
I could point out how believers can lose their inheritance but not their Sonship (like the prodigal Son), and that some Church Age believers may get left out of The Wedding, but are still Saved. But even that is unnecessary.
The statement in question about "making herself ready" in Revelation 19 is referring to her when she's already in Heaven. This is after The Rapture. It puts absolutely no burden on our Earthly walk, at all.
The argument is largely founded upon suggesting that we can't be Christ's Bride if we're His Body. I addressed this once already on a different subject. But I shall do so again in more detail.
"For this cause shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh? Wherefore they are no more twain, but one flesh. What therefore God hath joined together, let not man put asunder."Husband and Wife are made one flesh. The Lamb's Wife also being his Body fits perfectly.
The first Bride, Havvah/Eve, was made from a piece of Adam's flesh. Likewise we are made new creatures in the Blood of Jesus shed on The Cross. I believe part of the Reason Jesus' side had to be pierced by the Roman Spear was to fit him being The Last Adam.
The Church as The Body of Christ also overlaps with The Church being The Temple of God. 1 Corinthians 3:16, 1 Corinthians 6:19, and Ephesians 2:21. Also referring to The Body of each individual believer as The Temple of God. And in John 2 Jesus refers to His Body as The Temple.
New Jerusalem, which is The Lamb's Wife, is the final Temple in Revelation 21. Don't be confused by the statement of there being No Temple, there is no Temple because The City is The Temple. "Behold, the tabernacle of God is with men, and he will dwell with them, and they shall be his people, and God himself shall be with them, and be their God." Like the last verse of Ezekiel.
The message to Philadelphia confirms New Jerusalem is The Church.
In John chapter 3, John The Baptist defines himself as distinct from The Bride. If The Bride was Israel he'd absolutely be a part of her.
Israel is The Wife of Yahweh in The Old Testament. Married to him at Sinai. They point this out as if it contradicts The Church rather then Israel being The New Testament Bride. Israel is the Wife of God The Father and The Mother of The Son/The Messiah, as demonstrated in Revelation 12. [Also I'm not a strict Dispensationalist anymore, The Church is grafted into Israel as Romans 9-11 clearly Teaches.]
Genesis 22-24 is a very typological part of Genesis. Abraham represents The Father, Issac The Son, the Unnamed Servant is The Holy Spirit, Sarah is Israel and Rebecca is The Church. Likewise in Ruth, Ruth is The Church and Naomi is Israel.
I shall again quote what I consider the best Rapture Passage of The Old Testament. Joel 2:15-16
Blow the trumpet in Zion, sanctify a fast, call a solemn assembly: Gather the people, sanctify the congregation, assemble the elders, gather the children, and those that suck the breasts: let the bridegroom go forth of his chamber, and the bride out of her closet.The Bride is Raptured, Israel is not.