[1_Rain_Drop]

It is the same girl. Same smile in each photo and hair part.
Maybe the wrong girl was identified as shot. Maybe it was the one with the braids.

Isn’t the youngest daughter wearing the white dress at zero’s right side?

[Las Vegas Ron]

Isn’t the youngest daughter wearing the white dress at zero’s right side?

Yes, I believe that is correct.

The picture is captioned that they are the two siblings of Emily Parker.

http://www.dailymail.co.uk/news/article-2249148/Sandy-Hook-school-shooting-President-Obama-prepares-address-Newtown-emotional-memorial-service.html

[Las Vegas Ron]

BTW, here is her FaceBook page with pic:

http://www.facebook.com/home.php#!/RIPEmilieParker?fref=ts