If Eustacia had an iPod with an Egdon Heath playlist, then "Satisfaction" by The Rolling Stones would be at the top of it. The Stones start off that classic song with, "I can't get no satisfaction." And Eustacia is certainly getting zero satisfaction from living in Egdon Heath. In fact, most of the characters in The Return of the Native are perpetually anxious, restless, dissatisfied, and feeling trapped. This book takes place over just a year, but it seems much longer in terms of our characters' emotional lives and longing – entire epic sagas play out in various individuals' dissatisfaction with life. We can safely say that dissatisfaction is an emotional state that links all the major characters of the novel together.
Eustacia would be dissatisfied no matter where she was – her personality is just naturally negative.
Eustacia is depressed and dissatisfied largely because of the heath; if she had managed to escape to Paris, she would have been happier.