Seller says from South America, that's all the input I have. Since I thought she was pretty I purchased her anyway. Hope she is not a fake...marking under one hoof says only Made in China. I thought she might be one of the Brazil Exclusives, four Babyzillas were relaesed there according to mylittlewiki.
She could also be the Mexican large baby Minty, released with Desert Rose, makes more sense to me. Just found another page via google referring to these ponies and they say they are very similar to the Brazilian ones.