Li Muwan would have nothing to complain about. In retrospect, her trip was hardly any more dangerous than needing to remain in the chaos of the evacuation and war. In fact Wang Lin precisely saved her during a particularly bad incident in the middle of that chaos. Otherwise she didn't have more than a single really critical moment, when Wang Lin was still attempting a breakthrough but the Evil Fighting sect elders already broke the formations. However, she didn't need to suffer at all because Wang Lin made it in time. Otherwise she just got to spend a few years doing what she loves: making pills, using the rare ingredients Wang Lin gave her. She presumably got to keep all the extra ingredients and the high value pill furnace as well (and other things, like a dragon skin shirt).
It was time very well spent for a cultivator. She can even tell her noob sect brothers and sisters that she has lived a few years in the Sea of Xiu Mo. It's a place not even nascent soul cultivators enter haphazardly. They will look up to her.