@James2485
If this host has listed the accommodation on Airbnb,she can sent you the special offer via Airbnb. After your acceptance/payment it becomes a confirmed booking.
BTW "uncancel" does not excists, the previous guests need to make a new booking anyway
Tell the host you don't want to be in some queue, as you need to make plans also.
So ask her to sent the offer now, not wanting to wait until september 23rd
Best regards,
Emiel