Forced Diabetes and Pregnancy

so i have this friend that WAS borderline diabetic but literally forced yourself to become a terrible, full on diabetic. we have told her multiple times that she really needs to watch her sugar but she laughs and continues to drink her 104g of sugar drink and her 23g granola bar. The doctor told her too that she really needs to watch or the baby could have issues, but she refuses to stop. so, out of curiosity, what could happen to your baby if you do this and continue to eat 10x (or more) of your maximum amount of sugar a day (for a diabetic)?