Short and sweet. When you give excuses, you're cracking a door. Slam that thing shut.

"I'm canceling all upcoming appointments. Please do not contact me." - IG

Then send a separate email with, "Please provide my records. Thank you" to whomever is in charge of dealing with that.

The end. It's professional, polite, and if she does contact you, ignore, ignore, ignore. Pulling from DBT - be a broken record and in this case it means no matter what, do not respond to her.