What does the woman who reads Billy's palm tell him?

After leaving the cantina, Billy is drunk and stops in the first open barn he finds. He wakes the next morning with a horrible hangover to find children laughing at him. There's a woman there who provides food, saying that the children had said he was sick. He admits that it's a hangover and she says that having a hangover is a sickness as well. The woman reads Billy's palm and asks about his two brothers. One brother is dead and the other is alive. Billy says that he has only one brother and that he has a sister who died but the woman is insistent. When Billy tries to question her about what she has seen, she insists that it is "only a game."