The pronouns "she" and "her" refer to the city of Babylon, which is spoken of as if it were a prostitute. (See: [[rc://en/ta/man/translate/figs-personification]])
The word "voice" refers to the speaker, which is probably either Jesus or the Father. Alternate translation: "someone else" (See: [[rc://en/ta/man/translate/figs-metonymy]])