Grunting Noise?

My chinchilla is now 6 months old and has gotten much more vocal. Today she made a new noise and I am unsure of it's meaning. I keep all of her treats in a cardboard box, today she found it and was climbing into it. When I went to pull her out she made almost like a grunting noise and kept trying to go back to the box. I then pulled her out again and she made it even louder! Once I moved the box she went right on about playing and jumping all over me as if nothing had happened.



Is this a bad noise? Does it mean she is in pain, or is she simply whining because she wants me to leave her alone to eat all of the treats (like that'll happen)?