If the chemistry is not there, its not there. if she is giving you short answers and not smiling at you, you can rest assured all is not well. your response to her, may have shocked her and she really does not know how to respond to you. if i were you, i would do this…....sit down and write her a handwritten short letter, expressing how you feel about her. she may have received mixed signals from you in the beginning. this letter will tell it like it is with you and your feelings for her. if her response is negative toward you, at least you will know where you stand with her and vice versa. good luck.