Hi.
First of all can I just say that just because she eats crap does not mean that is the reason that she has gestational diabetes. GD can hit anyone at any stage in pregnancy. I have had it in all 3 of my pregnancies and I hate it when people assume its because I ate crappy food when that is just untrue. GD can happen to the healthiest people and its to do with how your body processes insulin in pregnancy. Of course, if she is still eating junk after being told she has it then only she is responsible for the effect her baby. I haven't touched chocolate in 8 weeks and trust me its horrible :lol: just didn't want people reading what your wrote and assume you only get GD if you eat junk food because that is untrue.
Anyway, onto other points. We have had 3 early losses and August 2009 we got a sticky bean

it was amazing but sadly our son passed away at 26 weeks gestation. We then hit fertility issues and needed treatment to have this baby. (currently 25 weeks) It really really gets to me when people think its ok to moan constantly about being pregnant, don't get me wrong, we all have our fair share of moans which you will discover the further along you get. Its when people get pregnant and then want to go out partying. I would love to have a drink with my friends or go to a club but I have a little life growing inside me and that is so much more important.
You are entitled to enjoy your pregnancy and so you should. Its an amazing thing that is happening. I love being pregnant even if it is the most stressful thing us women will ever do. It is all worth it in the end. It is just such a shame that not everyone sees it that way when there are so many couples in this world that would give anything to have a baby.
As for pregnancy yoga, its fab, I did it in my first, didn't get round to it in my 2nd and now have a dislocated hip so wont be doing it on this one. I am however practising hypnobirthing. To be honest (and this is not a reflection on your or your family) she seems a bit chav. I don't think its pathetic that you are enjoying your pregnancy, I think its lovely. Do what you think is right and let her get on with her pregnancy her way, try not to let her bother you xx