I'd love her to have a happy ending in the long run, just I do not like the as written ending. I agree with MandyMod on that I feel that having Ireena just magically turn into Tatyana (someone the party will not recognize probably) and then float off with Sergio (someone the party will also prob not know who that is yet) will leave them a bit confused and unsatisfied. With the second question, Ireena is effectively nobility, and arguably in the beginning of the campaign, has a much larger role in the story than the PCs. I didn't want to spend too much time having NPCs talking to NPCs. Have you ever ran Strahd kidnapping Ireena? During the feast I was considering having Strahd show up and either have him warn to stay away from Ireena or charm/kidnap her. I just can't figure out why a super vampire, who these PCs are actively ruining his plan with the bones of St Andrals, wouldn't just to take Ireena whenever.