(Choose stuff like Pears, lower in sugar than apples, sweet potatoes, brown rice, make your own brown/wholemeal bread rolls so you can make small ones) Lots of salad - turkey, chicken, fish...watch out for Carbs in the yoghurts! Red skinned peanuts make a great low GI snack and help keep full for longer.Have they given her a dietician?
Have they told her to stop eating anything but low carbs?
Has she had her fasting.tests and oral glucose test.
Is she on any meds?
The best way to adapt to trying to control is to eat small and often.
Something like
Breakfast
Yoghurt and a few berries
2hrs
Bacon and egg
2hrs
Ham salad
2hrs
Homemade soup
2hrs
Meat with veg
2hrs
A small Apple or such fruit
2hrs
Yoghurt with either berries or 85% chocolate.
You get the idea. This of course can be supplemented with her own requirements and taste.
Sorry if too many questions
Hope this helps.