in nervous conditions the novel , why does tambu object to her uncels plan that her parents have a church wedding?

Tambu feels the church wedding is a result of Babamukuru "having devised this plot which made such a joke of my parents, my home and myself." She is angry and resentful of Babamukuru for insisting that event take place. She finds it demeaning, and feels like it casts a shadow of sin over her childhood, but she cannot stop it. For the first time, Tambu disobeys Babamukuru by not going to the wedding.