How long does it take to alter a dress?

My dress was supposed to be finished on Saturday August 17th, but the owner of the dress shop called me to tell me that their independently contracted seamstress was sick and we had to move the final fitting date. I got a call yesterday evening saying that she will be out of commission for the next couple months and my wedding is on October 12th. The owner also told me that nothing had been done to my dress. The straps still need to be moved, the hips need to be taken in, a layer of crinoline needs to be removed, it needs to be hemmed several inches and I need a bustle. I'm panicked because I now need to go and get my dress from the shop and find another seamstress with six and a half weeks before the big day. Do you think this is enough time to do all of that? I've tried contacting several seamstresses but haven't heard back from anybody yet.