Meaning if she had stayed in design lab she could get a failing grade in chemistry and not be on academic probation because she would still have 3 decent grades? Who wants to fail a course and tank their GPA? An honors student in a competitive HS might have had 6-8 courses, many of them AP's, plus a commute, plus participation in numerous extra-curricular clubs to help get into college. A college student who lives on campus with no job should be able to pass 3 courses, especially when she can afford tutoring, although free office hour help is available for those who cannot.
I'm not saying she's bad, just incredibly complacent about the importance of trying to do well in college. Until she was forced to take the bookstore job, attending a few classes and doing homework was her only job. Maybe she was spoiled by a presumably easy "A" in Charlie's class freshman year. Are Vivek and Nomi really that much smarter then she is? They spend lots of time socializing and apparently both do really well.
Counterintuitively, the busiest people often do the best in school because they learn how to be efficient. Zoey appears to have no extracurricular activities that would demonstrate her interest in fashion to potential employees. She should start some sort of club. Aaron's an RA and is involved with lots of social causes, Luca creates art, and the twins have their sport, but we haven't seen Nomi, Ana or Vivek doing anything extracurricular, either (dating/drinking with your friends/ dealing doesn't count.)
I'd like to see Vivek or Nomi being a grader or undergraduate TA for a large survey course one of them excelled in, which would be realistic. Then we would have the inevitable story about one of their friends being enrolled in the course they are grading and how they will handle the conflict.