One possibility is that she becomes disillusioned with the Rebellion. Maybe she discovers some dark secrets within the Alliance that make her question their motives. For example, if she finds out that the Rebellion has been using unethical tactics in the fight against the Empire. This could push her towards the dark side as she feels betrayed by those she once trusted.
Perhaps she is captured by the Sith and subjected to intense mind - altering techniques. They could manipulate her memories and emotions, making her believe that the dark side offers a better path. In this scenario, her love for her family and friends might be twisted into a desire for power to protect them in a more 'efficient' way, which is a very Sith - like mentality.
Another idea is that she loses someone very close to her, like Han Solo or Luke Skywalker, and blames the Jedi way for not being able to prevent it. This grief and anger could be exploited by the dark side. She might start to think that the strict Jedi code is a weakness and that the power of the dark side can give her the strength to avenge her loss and prevent future tragedies.
Look to Chapter 20 for the clearest answer. It begins with Several people turned their heads upon hearing the sound and saw three..., keeps building through She was clad in a long black dress, and the dull color did not hide her..., and lands on So, he turned and questioned Jiang Li..
Chapter 865, "His brother is your ex-boyfriend, right?", is the clearest early answer because it turns Chen Nanqing's situation into a concrete plot event. The chapter turns that into something concrete by moving from I looked at your compatibility chart.
Chapter 27 is the strongest chapter-level answer because it starts from They had spent an entire year gradually inviting a few people. and follows through on Yes, I'm sorry." He nervously twisted his hands, "I was impulsive." "It's....
Look to Chapter 2 for the clearest answer. It begins with On the top floor of the Financial Building, a gathering of dark clouds..., keeps building through How dare Jiang Li hang up his phone?, and lands on Jiang, Lin Manru, turned pale and quickly explained, "It's not eloping, my....
The best chapter pointer here is Chapter 38, "Pretending to be a Top Student? You Must Have Forgotten Your Own College Entrance Exam Score!". It opens with Jiang Li had also observed the girl who had just entered.
A practical answer is Chapter 10, because it turns the idea into a concrete scene. The chapter opens with Qiao's shocked face struggle to recover, Lin Manru also tasted for the..., adds pressure through The young man stood motionless, his gaze fixed on the girl below, and..., and ends on Who was.
A practical answer is Chapter 9, because it turns the idea into a concrete scene. The chapter opens with Exactly, the Qiao Family isn't that great either., adds pressure through Since it was for the Jiang Family's welfare, then as the matriarch, she..., and ends on Qiao, unable to save face.
The best chapter pointer here is Chapter 64, "The Morning Battle". It opens with Chixia Village lay in tranquil slumber. and closes on He'd been a host for so many years; he was used to it..
Chapter 813, "She Has a Child?!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event. The chapter gives readers a real answer by opening on In the past, he might have helped Meng WanZhi speak.
Chapter 46 is the strongest chapter-level answer because it starts from Upon hearing this, everyone but Jiang Li perked up with high alert. and follows through on Did you calculate the score incorrectly?!" And 13 points?!.