Wow, you all sound so jaded!
I agree that having kids is no reason to get married - not by any means. But not wanting to have kids is not more noble than wanting kids. One person's screaming brats is another person's pack of jewels.
It's pretty obvious that this guy is not the one for her because she stated in the first part of the letter that she doesn't have the feeling she had at first and she's only a couple months in. Puh-leeeez, get over the guy and move on. Either that or she is very self UN-aware, and that at 30. If you're not sure then you're not sure and that doesn't mean yes, especially when the bio clock is ticking.
But I do sympathize with her because some women (myself included) DO want the experience of having children, I have children, both biologicially and adopted and love them, and TO ME, both experiences had separate gratification. For a woman, there IS a time-frame unfortunately, where there isn't (most often) for men. Maybe it's not the be-all to end-all, but it's one of those things that some people want.
She sounds like a disaster, she either needs to change friends or say g'bye to the guy, and since she's spent alot more time with her social circle, that is not about to happen.
Anyway, for what it's worth...