The workaround may be to tell TurboTax that you are printing and mailing your original return in Sept 1 of the filing section. You should then go ahead and mail your state returns since they have never been filed. You should then be able to start an amended return since TurboTax believes that you have mailed your original return and will now let you amend it. I don't know for sure that this will work but you can try it.
I assume you understand that you are seeking TurboTax help during the last few days before the filing deadline and that thousands of filers who have procrastinated for several months now want assistance. I'm not an employee but just trying to put things in perspective.
