She ran away from my Gith when I first met her and I found her later at the grove. In that conversation my MC did not register as a gith at all. But I should check again, maybe they changed it after patch 3.
Well, I played where I just called her bluff and ended up killing her and couldn't ressurect her - so I reloaded from the autosave and tried again. A successful intimidation check with an assertive "you will come with me" attitude got her to reluctantly come with me.