How to deal wih a friend?

Okay so my friend had her child january 2nd 2009 to a little boy. and yesterday his heart stopped and they had to put him on life support and this morning they said he was brain dead and later died. And we're the buddies that always text each other cause i go to college, so what are some things I can say to make her feel better? i know losing a child is like the worst thing that can ever happen i just dont know how to be there for her..