Skating for another country would only work if she still had access to the same level of coaching and training resources. Looking at Elizaveta Yuschenko, she got a CS by switching to Israel, but when she was in JGP she was capable of scoring 150+ and at Nebelhorn Trophy her score was some 40 points lower than that.
Stasya is kind of borderline at the moment -- domestically, she has been outscoring Pervushkina, Yuschenko and Ogoreltseva by around 20 points or so, yet she hasn't broken the 180 point threshold in JGP (although she has done so in 2nd tier international competitions last year). The fact that she still achieves enough content in the FS to get 110+ with multiple falls shows that the physical side (tech) is largely there, but she has to work on the mental side. It's always in the high stakes situations where she crumbles (e.g. Russian Jr Nats FS last year), vs when she gets to skate early, she goes clean.