Why did Dahlia commission Morehead to write for her newspaper? Why is Bertie curious about their arrangement?

Dahlia commissioned Daphne Dolores Morehead to write a serial for her newspaper because Dahlia believed having the author as a contributor would entice potential buyers, like the Trotters. Bertie becomes curious how his aunt managed to get Morehead, a high priced author to write for the paper, but Dahlia refuses to reveal her ways.