Newly Diabetic (Type 1)

I'm trying to help my sister (age 67) who became full blown diabetic (insulin dependent) as a result of breast cancer chemo treatments. She is struggling big time to learn how to follow basic diabetic guidelines (she's under the guidance of both an Endocrinologist and Dietician for the diabetes), and to manage the dips and spikes of her glucose levels. Unfortunately, she is in panic mode when this happens and the high anxiety and stress from that prevents her from trying to properly deal with this and to figure out what is ok and what is not. To date, every dip and spike has ultimately "corrected" itself, but it's been a petrifying ordeal for her. Any helpful suggestions? Of course her fears are understandable, but she will have to learn to live WITH this disease and how to manage it. Thank you all in advance!