See, in the filler episode, after first meeting Sara, Jaken makes reference to the human woman having such audacity to speak to Sesshoumaru in such a manner (she was very coplimentary and asked for Sesshoumaru to acknowledge her love for him), and Sesshoumaru corrects Jaken by saying she was a demon.
Considering that Sara had made the very same pact with her group of demons as Onigumo had made with his (by this, I mean exchanging her body and soul or a new body and lease on life to pursue her desires), she should only be a half demon, at best - not full demon (my guess is the only reason Sunrise had Sesshoumaru say she was full demon was because of Sesshoumaru's canon dislike of half demons - which meant if they kept Sesshoumaru in charcater, he would not have given Sara the time of day if she was anything less than full demon).
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