I want to say Becky's tears are thankful, but there's also so much loss with it, too. Much of her world is crashing down around her and changing, even Joyce. But, old Joyce wouldn't have been so supportive of Becky's sexuality, or accepting her as a runaway. Even with so much changing for the worse, there's still glimmers of hope that people change for the better, too.
Damn you, Willis.