Lol she's definitely not in china. I've got great six sense
Because she once said her dad wanted her to learn Chinese since they are Asian chinese and made her read a *I forgot how many pages book* everyday. This implies that she is not living in a Chinese speaking environment so definitely not China. Also, im not sure whether it is applied in the western countries, but in Asian regions, to have horse riding lessons are rare and mostly meant for the rich. Either our pyre chan is very rich, if not she's not in Asia...
But if we assume that Cure-kun's deduction is correct, ... Then US. Kekeke