I have very mixed feelings about this one, but I listened to the end, so I guess I have to say I mostly enjoyed it. Some of the scientific details already mentioned (orbital mechanics, mostly) did occur to me, but I'm generally willing to set those aside if they're not too blatant and are either dramatically necessary or if the way the work aren't strictly key to the story.
Unfortunately, the bit that left me questioning the actions of the characters left a bit of a sour taste in my mouth. It seems like a long string of really bad choices - not so much in the short term (go out side, repair the radiator vs. dying an unpleasant death,) but over the entire time span described. Earth had a nuclear war (unless it was aliens, of course)? We're already off to a particularly bad start, but that's not exactly a small scale choice, and it's mostly a matter of setting. However, what were these people on the station thinking that any of them had children? Yes, the mother obviously touched on this herself and Suyin finally came to the same thought towards the end of the story.
Honestly, I was thinking through most of the story that it was long past the time to just de-orbit the station already, or at least take a nice relaxing EVA without a tether. Maybe the central theme was hope may not be enough? (Alternately: knowing when to give up.) That's a bit bleak, but most post-apocalyptic stories aren't really know for being bright and sunny, I guess.
Um. I don't want to end on a bad note, so I do have to say that although I thought they made a series of bad choices, I did like the strong female characters!