If was a vision, then she could a goddess, a demon, an angel, a random spirit or any number of things. Just because a nice calming lady in glowing/flowing robes comes up to you and helps you out, doesn't mean she is or isn't a goddess. If she said she was a goddess, that still isn't definitive proof she is sadly. She could even be your higher self helping you out.
If this was a regular dream, she very well could be your unconscious self, or your older more mature aspect, appearing to show you that you should give over to your intuition more, and trust that you inherently know the answers.
Or it could have a whole other meaning. I honestly don't know. :)