Not at all, and I agree on the backstory. My point was that it just wasn't a very compelling ending to me, exactly the point on your last sentence - even if you have nothing to live for, you shouldn't give up on life. And because they didn't pursue the religious angle, I think they should have pursued why not giving up on life was so important. It felt more like a knee-jerk "I want to live!" type of survival requirement (and thus why we are left wondering why she didn't kiss the ground, haha) rather than a really good "here are some reasons you should still live, even if life is hard", you know?
I think a lot of people struggle with reasons why they should go on, with suicide, with loneliness, with depression, with getting lost in work and not having to deal with life, etc. I think this movie would have been a really good opportunity to showcase some motivational debate points as to
why you should go on living, even when you don't necessary have a reason, or feel like your reason was taken away (in her case, because her child passed away). Instead, all we got was a short "keep on truckin'" speech from the George Clooney hallucination. It just didn't feel like a very strong reason to push through all that, other than the built-in instinct to survive and not die. I think the ending would have been a lot stronger had they made it more motivational for her to live. They could have drawn from psychology or even just browsed articles on Wikipedia for ideas:
http://en.wikipedia.org/wiki/Philosophy_of_suicide
The movie just felt kind of "meh, she lived" at the end to me, instead of holy cow! She lived through all that, pushed through, was triumphant, and now has a reason to live! I just would have liked to see more compelling reasons for her to live so that the ending was more satisfying, that's all.