I'm sure your T didn't purposely not respond. There could be an endless number of reasons for the delay. Maybe she didn't get your email; it could also have gotten "lost in the mail". Maybe she hasn't read it yet because of something happening in her life. Maybe her computer is broken. Etc. Etc.
Try not to worry. I'm sure she will respond when she can. I understand about the obsessing. I check every minute for the email that tells me my T is home safely from her trip and it hasn't come yet.