what is Logan?

this pretty girl is named Logan. when i first bought her at a pet store her color looked like a normal ball python, nothing fancy or specail. but after a few sheds and 9 months later her color looks like this...
im wondering if she is something different or if her color is supost to change like this...
she is not a light brown... in fact she really dosent have any brown on her any more... shes like a greyish, whiteish, creamy brownish color...
if anybody knows what she is or anything i would really really like to find out.
thank you!!!