I'm not worried about a CS or any real data if a character is primarily there just as background or to keep the story moving; nevertheless, fleshing out more about the world is always good, and may lead to story hooks later.

As for sword tech, the nation she's from might be renowned for its development of sword technology (along with a throwback to feudal concepts of honor and chivalry); I'm imagining high-ranking officers in the army would wield beam sabers, photon cutlasses, and the like, along with a sidearm.  But other viable sword tech options might be monomolecular-edged blades, laser-edged blades, heat swords that are constructed out of a ceramic material allowing it to be heated up to high temperatures (a "firebrand"), a different sort of fire sword that is essentially a short-range concentrated flamethrower (it shoots a jet of flame much like a blowtorch, and requires a fuel source like a belt-attached fuel cell), or maybe a vibro-blade (using high-frequency vibrations through the blade to buzzsaw through matter).

I'm really planning on this being a world where a sword user could, theoretically (with the right powers, reflexes and skill) be able to fight off gun users - like Jedi, as an example.  And energy weapons are just as viable as "real" bullet weapons.  Hovercars will likely be a thing, though there is still room for wheeled vehicles or even legged vehicles.  There will be advantages and disadvantages to all of these different types of tech, which is why they are all still present.  A lot of the more advanced technology won't be available to the general public, which is why society hasn't radically changed from what we are used to in our modern day.  Just a little flavor for the world.