Alycia Baumgardner is unifying soon, fighting for the vacant WBA super-featherweight title. It would appear that Hyun-Mi Choi dropped the belt. Easy unification for the limited albeit extremely hard working Alycia I guess. Shame that Choi-Harper and Choi-Baumgardner never happens. Then again, perhaps it's better for the Korean.
Choi didn't vacate. She's supposedly "injured" and therefore is a champion-in-recess for now. Meaning she will get a first chance against Baumgardner after she becomes undisputed.