I think Dorothy needs to see somebody. She has stopped her bawling and wailing since Sophia has arrived, but now she seems depressed. It's almost as if Sophia told her "Hey kid, this is it. Get used to it. There ain't no going back home."
I think she misses her momma and her friends. She sighs a lot and does this dramatic flopping her head down thing. She's acting like a dejected teenager forced to move to a new city right before the prom. Who knows, maybe she left behind a boy she'd been making eyes at? Poor girl.