Actually, as far as I can tell, the only source for that claim is an August Counterpunch article by Assange fanboys (seriously, they recast him as Neo of "The Matrix") Israel Shamir and Paul Bennett. Here's the most damning evidence Shamir and Bennett have compiled against Assange's accuser:
1) She's published "anti-Castro diatribes" in a Swedish-language publication that, according to an Oslo professor, Michael Seltzer (who?), is "connected with Union Liberal Cubana led by Carlos Alberto Montaner," who reportedly has CIA ties. Let me repeat that: She has been published in a journal that is connected with a group that is led by a guy with CIA ties. Says this one guy.
2) "In Cuba she interacted with the feminist anti-Castro group Las damas de blanco (the Ladies in White). This group receives US government funds and the convicted anti-communist terrorist Luis Posada Carriles is a friend and supporter." That link goes to an English translation of a Spanish article noting that at a march last spring, Posada "wander[ed] unleashed and un-vaccinated along Calle Ocho in Miami, marching alongside" -- wait for it -- "Gloria Estefan in support of the so-called Ladies in White." Apparently, it's "an established fact" that Posada and the Ladies also share a shady benefactor, which means he should clearly be called a "friend" of the organization, and this is totally relevant to the rape charges against Julian Assange, because the accuser once interacted with them in some manner.
3) The accuser is a known feminist who once wrote a blog post about getting revenge on men, and "was involved in Gender Studies in Uppsala University, in charge of gender equality in the Students' Union, a junior inquisitor of sorts."