Is it (Yue) pronounced (You-way)? She certainly could have sailed on the same ship as Caspian. Probably a long-ish voyage from a cursory glance at your backstory? Plenty of time to get to know one another.
That is how I have ben saying it.
By my estimate Yue spent at minimum a 2 months at sea to get to the Saltmarsh. That is not counting the time spent in port or at anchor while resupplying and trading as the journey follows a coastline most of the way.
"Time is an abstract concept created by carbon-based life-forms to monitor their ongoing decay." - Thunderclese