Kisha Terrell is most likely a "homeless townie" (hence why you can't find out where she lives) who probably lives in one of the NPC apartments that active sims can never go inside. However, she isn't listed on Wiki's list of Bridgeport homeless sims, so I would have to say that she was probably generated for future use. You could find out where she lives by inviting her over, and then following her with the camera when she leaves your house.
While I have never encountered a sim that has no traits at all, I suppose it's possible. However, if you invited her to move in with you, the game would possibly generate at least some traits for her. Maids in particular either have different traits when they're npc's or will only have 3, but if you ask them to move in, a couple of these traits will change, or it will add 2 random traits to flesh them out. Repair NPC,s on the other hand will only have their 3 original traits if you move them in. So it's hard to say exactly what would happen.