andIt's kind of hard to tell if she's actually transforming girls into dolls, or if she's just making ordinary dolls based on girls she's been friends with, and then imagining them moving around and talking. She implies having bought them when talking about them in the first and last scenes, and that seems like a lie, but even then we don't actually know for sure. Maybe she does just buy dolls normally and then modifies them to look like people.
I like how wildly different in tone interpretations of this story can be. The main character is transforming her friends into lifeless dolls so she can literally own them forever and the story is horrifying. Or she's simply creating purely symbolic effigies of them that she can hold on to as a psychological defense mechanism against her feelings of abandonment from having to move so frequently in her youth and say goodbye to so many friends and the story is just really tragic.
For those confused: pages 6-9 are from the Doll girl's perspective, how she sees the dolls and how, atleast in her mind, they interract with her. While pages 10-14 are how the rest of the world sees it, the dolls as just dolls, not moving on their own. Are the dolled girls dead now or are they still aware and trapped inside their transformed bodies is a good question, but atleast to the Doll girl, they are and love being with her, as her play things.
The "friendship box" where the dolls are placed seems to be designed to make the two dolls kiss, reinforcing Doll girl's view that not only do her former friends like being dolls, but are becoming friends with each other.