It does not look like an Aztec headdress. It could possibly be Incan, but stylistically, it looks like a warbonnet from a plains tribe. According to the girl’s sister, the girl’s grandmother is Native American. However, it seems to me that if you were aware of that culture and were hoping to honor that culture, you wouldn’t do so by taking sacred symbols of your own culture and using them in a way that most who identify with that culture construe as offensive.
And I don’t see why we should pick on people with “Chinese” character tattoos (not always Chinese) or Pacific Islander tribal tattoos, and not this person’s Sexy Native Lady Warbonnet tattoo. They’re all equally offensive as far as I’m concerned.