I'm not sure.  I doubt Tai would see Nathi with anything but healthy distrust and suspicion (even if she helped with the rescue), but it also probably depends how much she knows about Dark Eldar (if anything), and how Nathi comes across to non-criminals.  They are (I believe) the only two Xeno on the ship, so that is something, but are kind of polar opposites in outlook.  Hrmm.