I guess, she could be on holidays, I remember that when I e-mailed my current T for the first time, she responded after two weeks as she was on holidays... It is also possible that she prefers calling, is totally booked and not nice enough to respond to clients which she cannot take etc... But I think, I would also resend the e-mail (maybe using one of this form) but maybe you could shorten it? Just give some general information and what you are looking for etc. you don't have to give the whole story in the e-mail, it is just to make the appointment...