HOW CAN I HELP MY SISTER?

MY SISTERS X BOYFRIEND THAT SHE STILL REALLY LIKED DIED IN A CAR CRASH A FEW DAYS AGO AND I'M NOT SURE HOW I CAN HELP HER SHE IS REALLY DEPRESSED AND DOES NOT LIKE TO TALK MUCH ANYMORE. HOW CAN I HELP HER DEAL WITH THIS LOSS?