it does seem strange.
my mother-in-law did this and she explained that after 20 some years of being Jane Doe, she felt like Doe was just a big part of who she was. i suppose that she also was not all together confident that her second marriage would last 20 years.
Makes you wonder if women who decide to take their husband's name might grow into IT in a few years and have it become part of them if given a chance.