Sal isn’t ready to forgive Margaret Cadaver yet, or Dad for that matter. But in this moment, Sal starts to see that Dad is hurting just as much as she is because of Momma’s absence—he’s just as “pitiful and lost” as she is. And Dad seems to suggest that while wild ideas (like the notion that the lunatic kidnapped Mrs. Winterbottom) might help a person cope with loss in the short term, it’s better to accept the truth in the long term. In this case, the truth is that Momma wanted to go, and she also wanted to return. This also implies that Momma didn’t choose whatever situation is preventing her from returning.