From your description of the spirit/goddess, I would think it is a spirit. I think this because, from my experience, spirits have a fog-like appearance. And after doing research on spirits, the air is usually cold when a spirit is there. What I mean is that in one place, it'll be cold and in another, it will be the normal tempurature.
The spirit was happy, which may mean that she might be your spirit guide. Your were working on opening chakraas, am I right? Then she may have been there to guide you, I suppose.