McKenna has just made: revocation.
Revocation can be considered as a process of cancelling any decision or a promise officially. This is act that makes something that exists previously to be null or void. For instance someone has accepted to sell his property to someone and now he has the rights top revoke or cancel that declaration officially.
In the given example, McKenna offers to sell her hand painted European tiles to Lori. But the cancellation of this offer occurs before Lori accepted the offer. She says to Lori that she has changed her mind and not ready to sell those tiles. Hence the example is associated with revocation.
