How does Baby Warren manipulate Dick for her own purposes in the novel, Tender Is the Night?

Baby Warren is in charge of her family's vast resources, and she uses that money to make certain that Nicole is taken care of. At one point she suggests to Dick Diver that she buy a Chicago doctor for Nicole to marry, and it is through her manipulation that Dick and Nicole travel alone together on a trip that leads to the couple's marriage. Baby Warren also knows that she holds the purse strings Dick needs to continue his lifestyle, and although she does not necessarily approve of Dick's marriage to Nicole, she ultimately wants what is best for her sister, and she is willing and very able to use Dick to those ends.