Do not try to impress. Be yourself. If you are not true to yourself, nothing that you do will seem right. When being yourself and somebody does not like it, then they are not the right person for you.
Be kind, generous, and understanding. Don't talk about yourself too much. Listen to what she says, and ask questions to draw her out. Be courteous and considerate. If she's not impressed by this kind of behavior, drop her like a hot potato.