User blog comment:Mr Easter/Could Kuina be tashigi/@comment-2109035-20131214234718/@comment-1595565-20131215002633

If that were the case, first I'd think that Zoro and Koshiro would try and restore her memory first, rather than just write her off. Second, if they did in fact write her off that quickly, then the stimuli of seeing Zoro and hearing his name, as well as seeing her old sword, and later hearing her name in Loguetown would have triggered those lost memories. Psychology, yo.