Wow, that was pretty close! Nice one!
Rayne would have won if, when she moved to the back row, she didn't go to that and instead went to the lower left. Instead of Ravaging Melody the 2nd time, she'd have had a lot more luck going for Melody of Madness since there was already a hole in your formation. Even at lvl20 that skill can be really, REALLY damaging in the late game. It's half useless in PvE but it's hax in PvP.