Basically after a certain degree of notoriety is achieved (ASOIAF or KKC) you as the author, while still having MASSIVE influence, do NOT have the final say anymore. If the fans hate some part of the story so much that they decide to ignore it, there is nothing you can do, you got overruled.
Now, this is similar to finishing books after the author’s death. If your story has a large following, and you presumably made money off that following, you have given up the right to not finish that series. Another author can pick up your slack. Hell, you don’t even need to be dead. I feel that after something like 10 years, if you dont continue your series, then morally it is fine for someone else to pick it up and finish it.
That said, whoever picks up the task of finishing a series, accepts the responsibility that they NEED to emulate the original author. You are not writing a new story, you are continuing an existing one.
People here are delusional. She can sue in small claims. It costs 30 bucks.
Or she can file a chargeback. You can dispute the chargeback but its a coin toss.
Basically you wont go to jail or pay fines, but 50/50 on whether she can forcefully take her money back.