Things have been going pretty well since Louise showed up—at least until Billie Jo and her father go to visit Ma and Franklin's grave. Louise wanted to go, but Billie Jo wasn't comfortable with it—she isn't quite ready to let Louise into that part of her life yet.
Daddy tells her that there's room for everyone in their family and that she could have allowed Louise to join them. Billie Jo disagrees, though. Letting her into their home is one thing, but Ma's grave is another.