explanation.

She has a physical injury, the front part of her body is cut because she was thrown into a ditch with glass, so she made herself a zipper to hold the cut better than a thread after surgery in the hospital.
Another terrible thing was that she was bullied by people, they just made her do more work than human children. But she was able to escape from this family, met a new friend who is also like her, he was an anthropomorphic dog.

I'll show you a picture of him some other time, his name is Chucky.