The regent Kaahumanu, ruling in the name of her young charge, Kamehameha III, seized the opportunity and followed many of the strictures favored by the Calvinist Congregationalists, who were modernizing the country through the establishment of schools and the printing of books in the Hawaiian language (which they formulated in a written form for the first time).
There was never anyone by the name of Kaahumanu in charge in Hawaii.