The baptism represents her brother Francis' child of the same name, not this Katherine.
Note 10 – (This Katherine Marbury, baptized as a teenager?) "England Births and Christenings, 1538-1975", database, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:J79F-Q9W : 4 February 2023), Katherine Marbury, 1625.