Is it really difficult to graduate from UCLA in 4 years?

My daughter is a first-year, has completed two quarters (College Summer Institute, Fall 2018), is currently in the tail end of the Winter 2019 Quarter, and has enrolled in the Spring 2019 Quarter. She’s been able to get the courses she needs so far, and I anticipate she’ll be able to graduate in four years. If necessary to graduate in four years, one can go to the UCLA summer sessions, which offer many of the required lower division courses (math, chem, physics, life sciences, psychology, sociology, foreign languages, and much more). However, while getting the required courses to graduate in four years is very doable, one has to be flexible with respect to professors and the dates/times of lectures and discussions. For example, in the upcoming Spring Quarter my daughter had to settle for a discussion section that meets at night, from 6 - 9 p.m.