Whoa, time out there!
You are not in love, ferchrissakes.
You had a nice dream about someone you knew. It was a positive dream. That's lovely. Now you are going to see the person (maybe; there are no guarantees whatsoever) in a group setting.
Don't be ridiculous. Don't be telling her that you and she are meant to be because you had a dream.
I dreamt I could fly the other day. I have not yet sprouted wings, no matter how real and lovely it seemed.
Get back down to earth, Romeo, and if you want to approach her and ask her out, then do so, but because of how you feel while awake, and how receptive she seems, not because of how your subconscious fired some neurons while you were asleep.