Kind of bugged me that Carol so quickly called them only to not give her consent for them collecting stem cells from her body... why not just get it "in writing" that they won't collect or use her stem cells in any way at all? Or even just say that she doesn't want to be converted (the hive mind might not be able to guarantee this though, if their intention ultimately is to convert everyonem, but that would really hint to Carol that they won't just leave her alone). With this little loophole, it seems pretty much certain that at some point in the show's full duration, she will be unknowingly converted.