Submissive or "slinking"

As evidenced by the "U" neck and tail laid over her back, Sage is sending the "I'm really little [meaning I can't hurt you] so please don't hurt me" message, in this case indicating that I have moved out of the "predator" category (no prey animals in their right minds try to talk to predators!).

In this particular instance, Sage is really curious, but wants to be sure that she doesn't trigger any scary behavior from me — she is not yet confident that she can predict what a human will do.

In context, this is a good thing. In isolation (that is, without any history), it could have many other meanings. For instance, amourous male llamas use this posture in an attempt to approach closer to females ... and I would not want to be on the receiving end of THAT concept!