Games : Lost 12 hours of progress; did I permanently kill the woman who Channels Blood Echoes into stat upgrades?

I was reading about NPC's that you can permanently kill - some you want to, some you might not want to. Included on that list was the woman in the Hunter's Dream.

Me and a friend have been playing together; and with the controller on its own on the sofa, the dog knocked it and hit the trigger and killed the Channel Blood Echoes woman :|

I didn't know whether she'd be dead forever - our current stats therefore locked in - so I pulled the power out of the PS4.

When I loaded the game back up, it said Save data corrupted and the Continue option had gone, leaving only New game.

Checking the PS+ Online Storage, I found a saved game from a few days ago, but I've now lost 12 hours of progress.... lol!

I'll replay it all, but I'm left wondering whether I pulled the power cord in vain, or not? :P