Juliet is dead now — at least in the eyes of her parents and extended family. Instead of marrying Paris today and going off to live in bliss as her parents anticipated, she has died in her sleep.
It’s strange how easily Friar Laurence manages to steer the family away from all thoughts other than the one he most desperately desires: get her buried as soon as possible, for who knows — from his perspective — what will happen if his potion wears off before they get her in the family crypt.
But why isn’t Capulet more concerned with what happened? How could a young girl die so suddenly? I think the notion, prevalent then, that someone could die of a broken heart goes a long way in explaining this. For Capulet, it’s easy enough just to accept the fact that Juliet never really got over her sorrow for Tybalt’s death, and it was of that broken heart that she died.