In Revelation, “her” refers to Babylon the Great, a symbolic representation of a corrupt, sinful power opposed to God—full of idolatry, immorality, and persecution of the saints.
Where does scripture say "her" is the Roman Catholic Church?
When John wrote Revelation, the Roman Empire was persecuting Christians. Many early believers saw Babylon as Rome, not the Church.
But you would not know that because "sola scriptura".
It is a call for Christians in every age to stay spiritually clean and not get entangled with sin, false teachings, or worldly corruption.
I would say SDA have false teachings.
Jesus never starts a parable with truly, truly means he means it, just like if I say "you" it does not mean in any grammatical use that I am referring to myself.
Seems like your sola scriptura when it fits your beliefs. Same reason Luther had to cut seven books out of the canon.