She is her own aunt if her mother is her sister. if her mother is her sister, then she is her mother's sister.

And regardless, in breeding would NOT create such a degree of genetic difference. For there to be a big enough genetic difference for them to go "oh wow! This is a different species than Homo Sapien at an entirely different place on the phylogenetic tree!!" there would have to be a spontaneous mutation of many different genes, and probably rearrangement of the allele sequence...all due to inbreeding? I think there's a greater chance that an elephant will fall on my head during my next lecture.