She finished primary (Barneskole) and 'lower secondary school' (middle school/Ungdomsskole); she didn't finish 'upper secondary school' (high school/Videregående skole) yet. If I am not mistaken, all students (in Scandinavia) stay together for primary and 'lower secondary school' and will split up for 'upper secondary school'. However, not all students move on to upper secondary school. According to Wikipedia
73% of students graduate from upper secondary school. The 'general track' of upper secondary is normally required to enter university.