Who is the Highlander's Daughter?

She was born over 400 years ago in a world that is barely known to those in Toril or any other realm. The knowlege has faded into either a myth or is known as a place to be scorned or feared. She has lived a life that many would desire and hate at the same time. She is known to those close to her as Jennifer Adrienne Sanchez MacLeod-Fryntide or simply Jen. To those whom she works with in other nefarious activities she's called simply the "Phoenix", those of her home world know her as Jen or the Highlander Daughter's. Whatever name you know her as, she is different in both her personality and demeanor.
She can be sweet, gentle, and kind to those she trusts and the next, cold, dangerous, calculating and a person with the deadliest of intent with a thirst for blood when she is hunting. Other times she can be completely psychotic or completely neutral. In any given situation it's hard to tell if who you are seeing is the real person or simply a facade she plays to keep others at a distance.
She grew up in the Highlands of Scotland on Earth, raised in the traditions of her family and then some unknowingly being trained to bear a blade for it would be the only weapon that would determine her living or dying. Her family and her own race have been around longer then most can ever dream of. She is Immortal one of many who roam the lands and realms at times in search of their own kind and a race to gain the "Prize" as many call it. She was killed at the tender age of 16 and the meaning "16 forever" is an ironic twist of fate for her because she is now truly that. She can never age, never get sick, nor die of diseases that afflict others. She is also never able to bare children. She has traveled the world of her home world, having quite the extensive Military career including several of the most devastating wars that have rocked her world to almost complete ash, education, training in various things that she has proven many times over and other traits she carries. She wanders through each century, blending into society easily like a second skin, and then vanishing as if she was never there in the first place. She now travels various realms, the longest as of now is Toril, though she has vanished from there somehow and yet is still there.
She has married twice now one to White Lancer, the other Narsic Fryntide, having had 3 kids all adopted two now dead but one remaining in Quaevarr that she has all but left behind when she was dead there but allowed to live again somehow and came back here to this time period here but her memories of those places etc intact.
She is an enigma and although there are many secrets and other things that are unknown to many, there are a select few whom she has trusted to let know but a few of them. Whether or not what she has told them is true, only she knows what the real truth is until she lets all of it out.
For now most of what many know is but the barest of truth. And soon many will learn of why she still lives and what she lives for.