Because Brigadier Rawat wanted to do it himself but when his physical incapability made it difficult for him he rested all his desires on that unborn son of his
Explains Anjali's part but still cannot fathom what Mrs. Rawat was doing all her life.
Agreed that quite many girls get married post their graduation or masters, but the situation is changing. And certainly such a lame excuse was not expected from Mrs. Rawat. Would say Maithali convinced Anjali quite maturedly.
Really, what was Mrs. Rawat doing her whole life?!