How does Miriam react to Flora's information about birth control and how is that reaction a reversal of roles between her and her mother?

After Flora leaves, Meriam tells her mother about the advice Flora gave and how she thinks it's wickedness since it flies "in the face of nature." Mrs. Beetle agrees but suggests it might be worth a try. It is a reversal of roles in the sense that the usual stereotype is of the conservative parent balking at "newfangled" ideas of the younger generation; whereas, here, the mother urges the daughter to try something new.