I have the exact same issue, but its with Tempestuous Luandi instead.
Same issue, she spawned again so I killed her again and I have 2 of her bounty item in my inventory and I can't turn in the bounty.
I have tried reinstalling C++ visuals and DX multiple times. Reinstalled the game as well and still getting the same issue. I don't have any mods installed since I haven't even got the game to work yet.
I have the latest drivers installed and verifying the game cache is literally the very first thing I did when I got this error. Like I said I have no problems with any other games. This is literally the first time I have ever had a game not run properly on this PC.
I bought the game from Steam today during the sale and the game is getting a Visual C++ Runtime error on launch. The game never even gets a chance to start. I have no problems with other games and everything is up to date. I have attached the Output log, a picture of the error and my DxDiag.
output_log.txt
DxDiag.txt