Here is the website for the Gerson organization www.gerson.org/.
You/she/someone can find out on that site where clinics that practice Gerson therapy are. I think there is one in San Diego, CA but the 'real' Gerson clinic is in Mexico.
I've heard it's super expensive but I have no idea how much that is. Sorry. Also, there is a Gerson forum here at CZ.
Willow