While she is suspicious at times, she will never stop loving him.
And that is what she has come to represent, love and honesty.
Her rationale behind this was that if she was honest, and her reputation was good for it, then she would become free again. She would rather tell a lie and be the center of attention than be blamed for something. Elizabeth's part in this was to fire Abigail for having an affair with John.
Abigail's part in this was to try to kill Elizabeth by blaming her for witchcraft.
Elizabeth Proctor represents the only thing good left in John Proctor's life.
She is an honest women who would never lie to John, although he has lied to her.
They are basically opposite of each other, which makes their characters vital to the story.
Both Elizabeth's and Abigail's roles in the story can be determined by comparing what each women represents, what motivates them, and what they cause in the end.
However, John doesn't get mad until Abigail begins to criticize his wife, saying, "Oh,...
However, John doesn't get mad until Abigail begins to criticize his wife, saying, "Oh, I marvel how such a strong man may let such a sickly wife be—" before John cuts her off.