Sounds like some administrators I have had in the past. You might give her a short list of things that are medical concerns, perhaps a piece of lit from your diabetes educator. Give it to her with the brief statement that you are working to stay healthy, but there are some concerns due to chronic illness and you want her to be informed. Follow it up with an email to document that you have done this, or send the info that way. Friendly, brief email. Then if she has the same response, contact the professional organization. The legal department should be able to guide you from there. You will be able to prove you tried to educate her in a friendly way, should you need to. Hope it doesn't come to that!