after cancelling a booking based on price the client now has agreed to the price and dates but how can I send her a deal when the dates are now blocked
If you cancelled the reservation, the dates will remain blocked along with a finacial penalty and a cancellation review. If the guest cancelled the reservation , the dates would be open. It is not clear from your post what happened.
@Marissa130 Hosts should never cancel, because if you do, this is what happens. I would call airbnb and explain as best you can, and tell them the cancelled guest wants to rebook, ask them if they will unblock the dates.