Shi Peirong's two younger brothers in Yunzhou might not hold high positions of power, but they each wielded some authority; at the very least, getting Song Xiwen a job transfer should be no issue.
But Xie Jingying was well aware that her relationship with her uncles wasn't as good as her brother's. She could ask, but she wasn't sure of the outcome.
However, if it were Xie Yanhai making the call, not to say it would be 100% successful, but there was a 99% chance it would be. Both uncles regarded Xie Yanhai very highly.
If it were Shi Peirong... impossible. Even if knives were raining from the sky, Shi Peirong would never call her two brothers. Xie Jingying didn't understand the intricacies of their relationship, and at her age, she no longer wished to.
That's why she chose to ask Xie Yanhai to make the call.
But Xie Yanhai refused!