I've read her book. The only women who were "sexualy fluid" were those who at the start of the study were bisexual (however they identified themselves). Lesbians (there were only 3 in her study) were still lesbian at the end of the study, and straight women were still straight at the end of the study. Those who started attracted to both men and women (i.e. bisexual) moved about a bit depending on their relationships and changed how they identified their sexuality, but remained bisexual at the end of the study.