Hath avenged you on her (ἔκρινεν τὸ κρίμα ὑμῶν ἐξ αὐτῆς)
Rev., more literally, hath judged your judgment on her or from her. The idea is that of exacting judgment from (ἐξ). Compare the compound verb ἐκδικεῖς avenge, or exact vengeance from (Rev 6:10). The meaning is either, that judgment which is your due, or what she hath judged concerning you.