User blog comment:IamJakuhoRaikoben/Chapter 381: Where Demons Live, Review./@comment-24392697-20140419103450/@comment-7418318-20140419104259

It's all right there in the chapter. She was depressed because she blamed herself for her family getting chased out of their hometown and thought of herself as a freak.

But at the end of the flashback, Lisanna and Elfman were able to convince her that this wasn't the case. Between that and her being accepted into Fairy Tail, all the doors to the more lifely personality are open.