Mercifully, we don't have to endure too much of Dolores's simpering sadism. Harry, Hermione, and Ron break into the Ministry to steal the Horcrux off of her, and that's that.
From what we can tell, though, she's just as awful as she ever was. For example, she's keeping Mad-Eye's magical eye plugged into her door as a kind of half trophy, half surveillance piece. It's a gross thing to do with a leftover part from a fallen enemy, and it definitely speaks to her (lack of) character.