My mother's type 1 diabetis. Health b!

Hello, My Mother is 52 year old type 1 diabetic since 7 odd years, she's not on any insulin but she's prescribed with ERITEL AM, Triglycomate and Ecosprin. Her reports are good and even it was recorded 120 during fast. Her diet is mostly on complex carbs and rarely a protein with walking and house hold works as a major physical activity, though she's not physically strong, as i am a certified nutritionist, i am trying force her to get her macros right but that rarely happens with her with protein as we are purely vegetarians and we don't even eat eggs too. There are no other supplements in her diet than the above mentioned medications and a high complex carb diet. I would really want to know what supplements do i need to add in her diet to make her strong as i'm not sure including any as she's diabetic type1. i am into intermittent fasting of 16-18 hours and it has given me great health benefits and to drop my fat % level, as of my knowledge Intermittent fasting has a great health b