It sounds early to me in the relationship to make a judgment on why she is reluctant to talk during the week. You might try extending your dates to longer periods of time and gradually work towards adding more casual brief encounters during the week. When I say extending the date, I mean rather than just have dinner and a movie out, how about spending the entire day together? It might end with just hanging out at your place or hers watching TV. During the week maybe you could arrange to meet for ice cream or just take a walk in the park. The more "ordinary" time you spend together, the better you will get to know her and her ways. We all have to make accommodations for someone we want to be with. If she is worth it, you'll find a way. Best to you.