Wouldn't depression would be there, symptomatically, in the larger allegory of it being about grief and rebirth?

One good turn -

I would hope there's near-universal agreement here that, when it comes to what is and is not clinical depression, there's a difference between the opinion of a qualified mental health clinician and the opinion of, well, whatever we are. A bunch of guys who saw a film. It'd be interesting to hear what an actual psychiatrist thinks about Ryan Stone.

But like Trey suggests, it's less important how we'd characterize her problem and more important that we recognize that she has this problem. She goes from sleepwalking thru life since after her kid died to getting a second shot (rebirth) at living life zealously and joyously (more like the way Kowalski and that other dude seemed to live life). If you get that, then you've gotten the film, irrespective of whether you feel Ryan is clinically depressed or not.