I don't think wishing for ms (which isn't good for bubs either) because you're worried you will gain weight, is a smart thing.
You will gain the most weight in the 2nd and 3rd trimester anyway. A lot of that is fluid and water retention.
Just eat healthy, keep moving and don't do the "Oh I have to eat for 2 because I am pregnant, so I'll have 2 Mars bars now"
Why is she blaming weight gain on the lack of vomiting anyway???? I find that a bit bizarre and to be even very honest, it almost sounds like an excuse for gaining weight that she knows she shouldn't have
Has she got any proof that it was for the lack of ms? Could it not be the lack of exercise or the eating a bit too much?
Even with ms you still gain weight. Its pretty much a fact. It is what you do after birth that will decide if you keep the weight on or work it off.