Well, to make somebody have a dream of a particular subject, you would have to alter their mind, as the mind is what creates the dreams. And as random as dreams are, it is very likely that the dream you give her will make her like you less, not more. Realistically, a dream spell doesn't work on other people, as you cannot directly influence the person's mind.
In conclusion, my suggestion would be to do the following:
First, talk to her. Tell her you are interested in getting to know her, and ask her to lunch or coffee or dinner; anything to just be able to relax and talk.
Second, do it again. Ask her to dinner again, maybe a few days later, or a week later. Ask her to a movie as well maybe, so long as there is time you two can get to know each other.
Third, ask to make it official. This is the most awkward part, but is the best part, in many opinions. Simply ask her, on your third or fourth date, if she would like to start dating you exclusively, which means that you two would only date each other.
Lastly, enjoy the relationship! I can't promise you'll get this far, or that she'll love you, but I can promise you that many women do not like to hear "I love you" in the first few weeks of dating. Just go with it, really. That's all that I can say for that..