Jocelyn is a powerful Warrior. She said that her job was to get rid of as many enemies of the organization as possible or her daughter will be killed. And for that, she thought that she has to be as strong as possible.
Without any other thought, Jocelyn who was about to graduate from Green Academy, a powerful cadet who was already a level 5 Warrior, increases her level as fast as possible and could reach level 7 Warrior in just eight years.
Again, I can't compare her with myself because my improvement rate is way beyond ordinary. I don't know if that is normal or not because it's not something I felt but I do know that I am not normal.
Jocelyn was smart enough to not reveal her real level and stay as a level 7 Warrior even though she's already one level higher a few years ago she only said that she's a level 7 Warrior.