In chapter XVIII, Jane is faced with her female competition, Miss Ingram and the social class above her. She also boldly reveals her love for her employer by saying:
"I have told you, reader, that I had learned to love Mr. Rochester; I could not unlove him now, merely because I found that he had ceased to notice me--"
This is the chapter that she tells herself to accept her position in life and that Mr. Rochester will marry Miss. Ingram. These events portray Jane as passionately young and naive, but also doing her best to cope logically with the situation at hand. She knows from her life's experience that even though she longs for family and love that she will most likely be denied these things in her life. Once she accepts this, she doesn't stop loving Mr. Rochester, but because of her religious beliefs and propriety, she conducts herself properly in every situation thereafter.
In chapter XXI Jane discovers that her aunt wants to see her before she dies and Jane graciously asks for time off work to go see her. This shows Jane as compassionate, kind, and forgiving because she could have chosen not to go see her aunt at all. This is certainly a step forward for Jane moving from teenager to woman.
Mr. Rochester manipulates her by playing mind games with her for a few chapters and then proposes to her in chapter XXIV. For example, one of the mind games he plays with her is in chapter XX when he asks Jane if she would sit with him in his garden. Jane shows proper womanly courage and strength by saying yes to this crazy request. Ultimately, chapters 18-24 show Jane facing difficult psychological stresses and overcoming them with kindness and individual strength.