Her husband is 6'8 and she is 5'11. Her first child was large (9-ish lbs) but her second broke a hospital record at 11 lb 15oz. She did not have GD. She actually couldn't have any drugs because she had some weird infection in her leg and the combination of antibiotics, etc she was on would have interacted with any anesthesia, so she couldn't have a c-section either. The measurement standards are averages...and remember that means some babies have to be bigger than average!
I have heard that having GD is not as bad diet wise as regular diabetes. As far as I know, fruit, nuts, milk & eggs are all still fine. cutting back on refined sugars and flours is never a bad thing, but I don't think you should cut them out completely. A good pasta alternative is Barilla Plus; it's not only a whole wheat pasta, it's a combination of a few grains, so it's not as "grainy." I make mac & cheese with it all the time and don't notice a difference. I also add cauliflower florets to the pasta for the last few minutes of cooking, it's an easy way to stretch the pasta without really noticing.