Isaiah 9:1 (King James Bible) and afterward did more grievously afflict her by the way of the sea
The object pronoun her (italicized in the King James Bible) is missing from the Book of Mormon text. This case is similar to the numerous instances where the object pronoun it is omitted from the Book of Mormon text (there are six cases listed under 2 Nephi 15:29).
Summary: Maintain in 2 Nephi 19:1 the original Book of Mormon text that omits the italicized her of the corresponding King James passage.