I think that at this point you two really don't know if you two are truly compatible. That sort of compatibility can only come when you're living with someone long term and can see them in and out, day in and day out, for long stretches of time. (Two weeks over three years isn't enough.) Is it possible for one of you to go live in the other country for a few months? Yes, that may be a pain, but it won't be nearly as big of a pain as moving to another country only to decide that things aren't working out and her having to move back to the US.

Two weeks of living together is more like being on vacation, and when on vacation we have completely different mindsets (like it or not).

I say this as a friend of mine is divorcing his ex and he saw her only on weekends for 3 or so days at a time over a stretch of 7 years. They got married, and at that point they started living together. It wasn't until a few weeks after moving in that they realized they were quite incompatible. After 7 years of marriage they are getting divorced.