Xiao spent a large amount of time talking and chatting with Yurou. The fact that they couldn't meet really bummed her, so she was making the best out of it by talking to him. From what Xiao understood, Yurou had gained a very high position in the shrine of fire. Right now, she's being taught by the best of the best.
Everything related to cultivation, growth, skills, martial techniques, everything was being drilled into her. Thankfully, she didn't need a cultivation technique like the ones required to grow her flames, as the ones she required were passed onto her by Empress Amber. After all, unlike humans, the phoenixes grow by cultivating their flame.