Well with KAZ buying players and Maria being a very promising one, they probably found a way to convince her to plat for KAZ, which isn't strange as she was born there... It'll be interesting to see if she's going to play for KAZ for the rest of her career...
Good for her.
Unlike other 'kazak' players she is a true kazak cause she was born there and lived there 8 yrs or something. Understandably she moved to a different country for the facilities but this doesnt mean you need to represent that country.
She's only 14, so it's most probably her parents' decision(most likely her mother's as I've never seen/read anything about her father), she might switch back to representing USA in a few years which would definitely benefit her more in terms of sponsorship deals etc..
"It's been a while since I made a post but I just want to say Happy New Year everyone! Wishing for a successful year along with happiness and... well... everything good. I'll be playing some more pro tournaments so wish me luck! Love, Maria."