I checked out their website: it seems that they indeed offer the option for those studying for a Bachelor's degree on a 'civil university' to take up military training during their vacation/holiday periods and become an officer in that way. They will even pay for your university studies, however, the requirement is that you will continue your career in the military. If you don't, you'll have to pay them back.
However, it seems you need to complete your Bachelor's degree to become an officer and Elisabeth only completed her second year, so I would assume she'll have one more year left at university... So, I am not sure how she'll be able to become an officer this year (unless they don't require a Bachelor's degree but only a minimum number of credit points and count her first year at the military school towards her minimum number of credits.