The tenure of former President Donald Trump’s wife, Melania Trump, as the first lady was marked not only by her public engagements but also by an intense internal rivalry with daughter Ivanka Trump, according to Katie Rogers’ new book “American Woman: The Transformation of the Modern First Lady, from Hillary Clinton to Jill Biden.” The internal power struggle reportedly unfolded amidst Melania Trump’s efforts to renegotiate her prenuptial agreements, painting a complex picture of her time in the White House. According to the book, which The New York Posthad an early look at, Ivanka Trump attem…