How is Mildred an example of how Montag’s society controls its citizens, and yet how the citizens are deeply unhappy about their situation?

Mildred seems to be totally controlled by the television screens in her home. Her one desire is to have one more gigantic screen so she can be surrounded by what she calls "her family". Yet, she also tries to commit suicide by taking an overdose of sleeping pills. Obviously, "her family" is not bringing her the satisfaction nor support that she really needs. Mildred also feels threatened when Montag takes an interest in illegal books. In fact, Montag realizes that Mildred is only happy when he is doing what he is supposed to be doing. He is not able to express ideas contrary to what society has taught them, even in his own house.