I would recommend working with a licensed ketogenic dietician. You can find 3 of them here: https://www.chrispalmermd.com/clinicians-doctors-coach-dietitian/
Alternatively, you can refer to the book – The Ketogenic and Modified Atkins Diets: Treatments for Epilepsy and Other Disorders – in order to get a comprehensive overvieww of what is involved.

We are wanting to help my daughter, who has schizophrenia and has been on Clozapine for 3-4 years. She has somehow remained thin — until recently, when she’s started gaining weight (15 lbs in the past month), craving carbs. She’s willing to try a ketogenic diet. Do you have a journal article or video that is a bit more prescriptive/detailed about what the prescriber needs to do to monitor their patient (or daughter, who sees another psychiatrist who is short on time but has good intentions)? Thank you!