YOU SAID:
違う人になっていた
INTO JAPANESE
違う人になっていた
BACK INTO ENGLISH
I was a different person.
INTO JAPANESE
彼女はまるで別人だった
BACK INTO ENGLISH
She was a different person.
INTO JAPANESE
彼女はまるで別人だった
BACK INTO ENGLISH
She was a different person.
That didn't even make that much sense in English.