So? She didn’t die in the story. That’s all we need to know here. That’s the relevant information.
Which would be taking place after the events of Conan Exiles, so…
I highly doubt the Riddle of Steel DLC was meant to be an explicit acknowledgement of the '82 movie as Official Funcom Conan Canon and that Howard!Valeria and Movie!Valeria are somehow the same person despite their respective stories being fundamentally incompatible with each other (to say nothing Conan’s story in the movie being incompatible with that of Howard’s version).
And all of this is moot anyway, because I looked up when Conan Exiles is set:
In terms of time frame it takes place between Xuthal of the Dusk and a Witch Shall be Born (following the Dark Storm chronology)
And according to the Dark Storm chronology, Red Nails is set well after those two stories, so Valeria would still be alive anyway.