Rochester promises a wedding in four short weeks. After the engagement is announced, Mrs. Fairfax congratulates Jane weakly and warns her about men and marriages between unequal parties. Jane is irritated with Mrs. Fairfax's assumptions, but is also still a little suspicious of her fiancé.
In Brontë's time, it would have been scandalous for a gentleman to marry his governess. It's unclear if Mrs. Fairfax knows about Bertha, but even if not, she has reason to be suspicious of his rush to marry.
Feeling like she's living a fairy tale, Jane is exuberantly happy—at first. But when Rochester starts lavishing expensive gifts and flattering compliments on her, Jane feels objectified and degraded. She demands to be treated normally, to live on the salary she earns as a tutor, and to dress in her plain outfits.
Rochester treats Jane like Céline Varens. Jane refuses to be his love object, dependent on his gifts and money. Her self-respect stems from independence, not inflated self-esteem.
Jane privately decides to answer the letter from her uncle, John Eyre, which Mrs. Reed had kept from her. She does so because she thinks that if John Eyre made her his heir, as the letter stated, she would be closer to Rochester's equal in terms of class.
Unlike Blanche, Jane doesn't value money for its own sake. She needs it to be independent, to meet Rochester as an equal. Despite her love for Rochester, she senses the match isn't right.
Throughout the wedding planning process, Jane resists Rochester's romantic overtures. To put him off, she argues with him and aggravates him. But even so, she still worships him like an idol.
Jane puts Rochester before her love of God, which is a serious sin in Christianity and will require her repentance.