Final answer:
The most pivotal secret of her success in becoming an able student is diligently performing the required readings, which underpin her studious habits and work ethic.
Step-by-step explanation:
Among the described secrets of her success, the most critical for becoming an able student appears to be actually doing the assigned readings. This action shows dedication, enhances understanding of the material, and prepares one for class discussions and tests. Furthermore, committing to the readings fosters studious habits and a focused work ethic, which are invaluable traits for academic achievement. Her practice also likely contributed to her broad and thorough training, setting her apart from peers who did not engage with the material as deeply.
Being a student who consistently completes reading assignments can manifest in improved grades, as demonstrated by maintaining a 4.0 GPA while balancing other significant life responsibilities. Additionally, this approach increases the likelihood of becoming well-prepared for advanced education and future career challenges. From the context provided, we see that persistence in reading is correlated with overcoming the shortcomings of not being well-prepared, as indicated in the example regarding students needing assistance to get into elite colleges.