The story of Beren and Lúthien is a precursor to Aragorn and Arwen's plot in the Lord of the Rings. If you want to read their story, the whole thing is pretty short and can be found here: https://melmoth.redbrick.dcu.ie/p1.html

For the sake of most of my RP with her, I prefer to have her meet people before the events of that tale play out. She pines otherwise. But yes, maybe she picks up a half-dead Geralt and nurses him back to health. That seems to be the kind of service he requires frequently.