Weapon smith Ornifex died in Shaded Ruins and there is no tombstone

I got swamped by Basiliks in the shaded ruins whilst freeing Ornifex and she got petrified to death :( She did mention that she would re-locate to Brightstone Cove Tseldora before she died, however when i return to either locations there is no tombstone to be found. Is this just bad luck, or is there some other way of getting that tombstone to appear (excluding restarting from scratch or NG+)

Thanks

I've tested killing several important NPCs such as merchants and I have seen that they "come back" as tombstones after a few "real world" hours. The same applies to Ornifex, her tombstone will appear in her prison cell when killed. I believe the amount of souls you need to trade with her is 11,000 souls.

In any case, if the tombstone is not there after a few hours or even restarting the console and the game, I don't think you'll have any other option than to start NG+. Alternatively, you could use a Bonfire Ascetic at the nearest Bonfire to force that area alone into NG+; it'll make everything, including any bosses, respawn as NG+ level, but will also respawn all NPCs and most lootables.