If she's gonna be away studying for 4 years (is there an official source for "4 years" or is it just a guess?)
Argh....I got it from a guy on 2ch who claims she said it herself. It seemed valid but I didn't hear her say anything about it on the Ribbon no Kishi recording.
Maybe that guy at 2ch got confused with the part where she says she will treasure this 5 years, talking about the time she spent in MM
Argh....