No prayers from me[*], but you (all of you, the girl and the rest of your fambly) are in my thoughts.
A tough question I suppose must have occurred to you already (but just to make sure it isn't forgotten): Is it too late to reconsider the No to abortion? Looks like events have changed the premises the roiginal decision was based on... But (sorry, I forget when it was) Time may of course have rendered it moot. In that case: Sure, being a single mother is hard -- but not impossibly so! With the support you, her parents, seem to be ready to give her, she'll come through, and so will your grandchild.
Feeble attempt at cheering-up: Pregnancy depressions aren't all that unusual, I gather. And, hey, when it's a young girl (possibly with her hormones still in flux anyway), and events actually seem to *be* rather deperessing... No big wonder she's disturbed at the moment. I'm sure it'll all get better soon.
[*]: Say I'm "keeping my fingers crossed" -- hey, as I see it, the chances of that helping are as good as those of a prayer.