The Gray Prince (1974) by Jack Vance
It is actually a complete coincidence that I found this. I was searching through my local library's catalog for science fiction books in hopes of getting one during my next visit. There it was! The title seemed familiar and I thought the title was interesting so I went ahead and clicked on it!
The main character's name is Schaine Madduc and her home planet is Koryphon (which doesn't start with a "V"!). She actually spent 5 years in space and, when she comes back, it's all rebellion, rebellion, rebellion! Here are the Wikipedia and Goodreads pages for anyone who is interested!