Kate, for what ever its worth - I wouldn't wait a week. Weeks can add up to months and after all you've been through, the response time should be faster. Esp. because it is being processed as a rush order.
The manufacturer should be able to fax a confirmation order w/ a delivery date to the bridal shop, and then the bridal shop can either fax it to you or you can pick it up.
When was your first post on this? Add on 1 week from THAT date.....I'm glad things are going well w/your bridesmaids but I don't think you should ease up on your dress until you have something in writing verifying your order. They have given you plenty of reason to question their abilities - its now their job to provide you with comfort.