Not for Mia. No option to give her a special pastry. And, as I've ranted about before, IMHO you shouldn't have to 'work' at these relationships. It's a video game about banging chicks, not a real relationship. Once the MC completes the quests/gameplay elements that get him there, the sex should be an available option, not a randomized crap shoot. If the dev is adding more content, maybe have something happen and the MC has to do a new quest to win her back. But just leaving for a few days to play the other content in the game should NOT negatively affect the relationship. That's the one shitty aspect of an otherwise excellent game.
For me, ideally, once a relationship arc is complete, you shouldn't need special pasty, or vampire powers or even just to sleep overnight every so often. Finish the quest(s), win the girl, done.