Here's what I know of the song but I'm not certain how accurate it is.

In a home a lonely girl lay dying
While Christmas bells ring out so clear
Beside her bed were Dad and Mother
Praying God to save their daughter dear

Will there be a Santa Claus in Heaven?
Will there be a Christmas tree up there?
Will there be a lot of other soldiers
With their girls and other things to share?

As the breath of life was slowly fading
They knew that Death was on it's way
As they raised up their darling daughter
In a whisper you could hear her say
"Goodbye Mom and goodbye Daddy darling
Please don't cry as all my pain is gone
?
?

There are at least two more lines but this is all I remember.