"Sorry." Seeing how worried they were, Song Nianchu felt a twinge of guilt. "During the last few days, I came across a large-scale formation base. The formations there were numerous and dense, and the Jade Slip had no signal, so as soon as I came out, I rushed back."
At the time, she figured she would be returning shortly anyway.
Thus, she didn't waste any Spiritual Power trying to contact her uncle and the others.
Chapter 398