I’m not sure I understand the question. If you mean, why does she tend to look like the people in whatever region she is being venerated or said to have appeared, I was always taught that she is the mother of us all and will appear physically like “her children” in a specific place.
So, the images of Our Lady of La Vang look different from Our Lady of Fatima who looks different from Our Lady of Guadalupe, etc.
Presumably, Mary in her glorified self is no longer bound by human form, so she doesn’t have to always look the exact way she did on earth.