Let me get this straight.
You take pictures of a preteen girl from right after WWI. Said pictures were produced with film stock and cameras and lighting that aren’t the best ever. Said preteen girl and her friends are in the middle of being exposed to all sorts of diseases (including the influenza that will kill two of them), while not being super-well fed. Said girl has to work hard with her hands and walk around barefoot all day in all weathers. Said girl is constantly being harassed by newsmen, neighbors, her parents, the local authorities, and has recently spent time imprisoned.
If you want to take a picture of her, you have to make her stare (or scowl or squint) into the sun for long exposure times, while she holds still and tries not to blink. Remember that smiling pictures are undignified or unladylike, and the kids’ parents are probably standing behind the camera, giving the kids a hard stare the whole time.
Then you take a picture of that girl as a middle-aged or an old lady nun, with totally superior camera, film stock, and lighting, and probably with retouching for beauty, The nun gets to eat well-balanced meals regularly, is not being exposed to disease and the extremes of weather, and is not being harassed or imprisoned. She receives modern medical and dental care. She doesn’t have to worry about going short of fruit and vegetables in the winter, and she probably got decent amounts of calcium in her diet all year round.
My grandma looks a lot different now than when she was a girl living poor but proud in Tennessee. It’s almost as if she spent the intervening years with a good diet and good medical care and nice clothes and a car. And her nose slowly grew bigger than it used to be, just like with every other old person I’ve ever heard of, even though her face also filled out from getting to eat decent quantities of food.
So I guess Grandma was also kidnapped and replaced. Replaced by someone who got a good job and made a good marriage, or by someone who didn’t stay a poor preteen girl all her life.