Upon returning from their shopping trip, Sophie and friends find a collapsed person in front of the house.
Apparently she had collapsed from hunger, so they invited her into the house.
When asked about her identity, she proclaims that she is a vampire hunter, and explains that she's come to vanquish the vampire that lives in this neighborhood.
Panicking, everybody does their best to conceal that Sophie is a vampire.
I've come over since it's dark out.
.أتيت بما أنّ الظلام خيّم في الخارج
Vine porque ha oscurecido.
Vine porque ya es de noche.
Sono venuta a trovarvi, 
visto che si è fatto buio.
Я пришла, как только стемнело.