I would get a little less "nice" about how I try to get her to stop; obviously she does not hear/listen to hints like "you told me that already". I would say, emphatically and with a very serious look on my face, "I do not want to hear about that/again" which would cover both the repetition and and self sex talk? She would then have to take some responsibility for what she talks about if she wants to talk to/be around you.