23 hrs to closing and Seller wants to back out!

[Jason Douthitt]

I contracted the property on Jan 31st with a closing date of March 3. The lien holder's LLC was out of date with the state so we had to wait until it was updated for the lien release to be valid thus had to get an extension for the contract. I assigned the contract to an end buyer.

Now after waiting several weeks for the lien release, the seller wants to back out. They state they never delivered the signed extension to the title company. I do have text messages from her promising that it would be done. Closing is scheduled for 3pm tomorrow. The seller is supposed to call me in an hour. 

Any thoughts?