For this to work, the doll has to be printed on card-stock or been glued to some. It won’t work if the doll is just made of flimsy paper. I used Florence to demonstrate this method, but it will work with any of the paper dolls that have bases.
Sorry about the image quality. I only have an iphone for picture taking and I know it’s not ideal.
Cut out the paper doll and place her on top of a spare strip of card stock, at least three or five inches wide. Carefully draw a line in a curved line down from the doll to the bottom of the card stock. I recommend doing this in pencil. I did it in bright red pen so it was visible.
So, after you cut out the stand, it should look like this. Draw a line a quarter inch in to make the tab to glue to the back of the doll. I’ve drawn the red line where I would fold back this tab.
Fold back the tab and then glue it to the back of the doll. Double sided tape would also work fine, I think, but I always used glue.
And now the paper doll can stand on her own.