String of Declaratives + Anaphora : Finally, even her mental resistance has finally gone, signalling the end of her story -- mind and body has been both subjected to Gilead.

The string of declaratives and the fact that the repetition of the anaphora "I'll" is a final show of power. She is showing her active will of submission -- not that she is forced to submit but that she is, on her own will, submitting. In this way it is not only a show of power but a transformation of Offred's fiestyness with Moira in her to her most submissive self, becoming finally a true believer.