@Xarxyc
I'm not saying it's "required", I'm saying it's the primary means of identification- and it is.
You usually don't have a DNA record of a random civilian, or their fingerprints, on hand. It's why most corpse identification is done by having a relative come in to look at the body and verify who it was.
The closest they could manage, DNA wise, is to check whether the corpse is directly related to the girl's parents. But that would be at the personal inquiry by, and expense of, the girl's family.