I would say she does look slightly...off but again, she might just be a rare color. She's so young it's hard to tell. How old is she? And again, why do you think the breeder lied?
The mom being a white Boxer might account for this odd coloring. I'm going to say right off that this wasn't a good breeder if the pup's mom was white. Good breeders do NOT breed white Boxers. A lot of them even cull them out at soon as they're born. Aside from the fact they're a breed fault, they are genetically weak like @
annageckos said, because they are VERY prone to deafness and blindness. Those dogs do not carry any genes you want to pass on.