That's a Campbells; Winter whites don't come in black. If you want to get technical, you could likely assume it's a hybrid... i mean, it's of no significant importance for pet purposes (so i dont tend to bother, unless it's literally a 50/50 split between the two; personally, I just call them Campbells or Winter Whites, depending on physical attributes), but it's very unlikely to be a purebred (especially knowing she came from an unethical breeder; given that they misidentified a species who has very distinctive traits). But yeah; campbells, or campbell hybrid - whichever you prefer.