You are right, they are not dead. This site has many pictures and many categories. Post mortem picture are in the Post Mortem Photography galleries. As you can see the above picture is posted in Antique Photos Galleries, which has also many categories but are all alive unless mentioned otherwise.
She is and she is very populair under postcard collectors. You will find more of her in the postcards galleries.
Many collectors have tried to find out who she is and what became of her but till today no one succeeded.
This is what I found about her:
"No I dont know the real name of the girl and I believe nobody knows. Couple of years back when she became popular on Ebay she was first known as the TPD girl. The name comes form "The Photographers Daughter" and was based on the theory that being photographed on so many postrcards in so many difernt poses, costumes, wigs... she must have been related to a photographer and was maybe a photographers daughter. I have never seen a prooof of that theory, nor did anybody else as far as I know.
Then she got named Loa by an Ebay seller, and avid collector of her photos. A wonderful name for a wonderful girl, which is also, as far as I know, not grounded on facts, but I may be wrong there.
There are thousands of diferent postcards of this particular girl in all stages of her growing up, from a cute little girl to a beautiful teenage queen, posing as blonde haired, black haired, long haired, curly haired, with or without braids....
Until this day nobody has discovered what she looked like as a grown woman. Did she stop modeling when she grew up?? Has she married and her husband has forbiden it, or the woman she has grown up to be is so very different from the girl that we cant recognize her???
There are many questions that have not been answeered and also many people searching for those answers, and maybe one day we will know her name, who she was, how she lived and what became of her.
"Mistery Girl "is as good a name for her as any.