SD400 Night Snapshot mode - what does it do?

I ask because I have 2 very important snapshots that came out blurry, and I'd like to see what I can do to improve the quality, perhaps using Photoshop. I've actually attached the shot for reference.

As background, it's the last time my wife's grandmother was with her family - she passed away last week, 3 days after this shot was taken, so you can see why anything we could do to improve image quality would be a good thing. What happened was that I was using Night Snapshot mode but shooting indoors at a family dinner during a relatively bright day.

Any information or suggestons would be appreciated - I've checked the Canon site and surged the net for a while, but can't get any real specifics on what "Night Snapshot" mode does.

TIA - R.

HOSTED PHOTO
please log in to view hosted photos in full size.

HOSTED PHOTO
please log in to view hosted photos in full size.

I think Night Snapshot allows a longer exposure than might otherwise be the case. That will give you some background detail at night, but won't make it long enough that you'd really see the background enough to notice motion blur; the flash would stop the subject, and you'd basically have what looks like a crisp shot. With a fairly well-lit environment, the available light (at 1/8 sec) will let you see the motion blur (camera shake).

I think your best bet may be to apply noise reduction to the first photo, then try applying a little sharpening to it.