I had a very similar issue to Dorothy my Freshman year of college. I mean, I never was a perfect student like her. But I came to college with way too many interests and this can-do "try anything once" spirit.
My first semester I was writing for the newspaper as an opinion writer. But a couple weeks into my 2nd semester the opinion editor got bumped up to managing editor and the new opinion editor was a massive prick, so I quit. My grades improved rather quickly after that, even with me still doing debate team, volunteering, and a few other clubs. I hadn't realized how much of my time and attention it took up.
Which got me to thinking why Dorothy, a pre-law major who wants to go into politics, is spending her time writing for the paper. That seems like a droppable interest.