Here the 1830 typesetter accidentally changed the preposition in to into. There are two other passages in the Book of Mormon that refer to “being brought ... low in the dust”:
There are no instances of “into the dust” in the Book of Mormon. So the restoration in 2 Nephi 26:15 of “in the dust” for the 1837 edition is obviously correct. The printer’s manuscript was the probable source for restoring the correct reading.
Summary: Retain in 2 Nephi 16:15 the preposition in in the phrase “in the dust”, the reading of the earliest textual source (here the printer’s manuscript).