lol Kura, theres no way to bring her back other than using a GS - I've tried all the rumoured ways for countless hours and there is no way lol
Rumour has it, they were going to put in a revival method, but they needed to get the game out quick so took it out. But the one thing they left in, was her ghost at the church. But I've never seen it.
But hey, its just a rumour