leaving the country after high school?

I am Junior in high school, and I am considering leaving the country after high school, but I still want to enroll into a university here in the US.

I know someone who is currently studying in Switzerland (she is doing her first two years on college there ), but she is enrolled in a school here in america. i dont have contact with her so i can't ask her myself...I want to do the same thing as she is, but in a different country in Europe.

How do I get into this kind of program? did she do the regular study abroad program? or is something different.

Any help is appreciated, I need as much feedback as possible because I am seriously considering this an option after high school.

Thanks!