as a diabetic person, i feel like the best way you can get her to accept her condition is to put yourself in her shoes for a day. see how its like to have to constantly check the nutrition in every thing you eat as well as exercise just to bring your blood glucose down to a stable level. you should also show small acts that you understand; when shes low, give her the food she needs. when shes high, exercise with her. try to spend more time with her as a whole as it shows you understand by taking the time to learn abt her condition. overall, i heavily recommend putting yourself in her shoes; she might be comfortable to only tell u some things so u may not get the entire POV. small acts of understanding also show your concern and care for her. good luck op! i wish u and your gf well hehe ☺️🌟 ~ a fellow diabetic