The history should be generic. Especially since, as you say, the players--and by extension, the characters--should shape the universe: if you make the character too special to begin with then there's nowhere to go, and not so much impact to make. This one looks fine, I'm just debating the theory, not this character in particular. Despite the cliche orphan route, the history is legitimate but for the issue of the species.
What's wrong with the character having been a Geshrin to begin with? As you say, it wouldn't really make a difference in-game, except that the girl would have a completely different worldview...but then, since she would have one radically different if she was a former Nepleslian female, then it actually would make a difference whether or not this character was Nepleslian. The character's values, worldview, and even behavior would be specialized because Nep females are so rare: this is probably one of the reasons players are not typically allowed to play them.
If you try to tell me that the players should shape that, I'd ask, do you think that a person who grew up in a different country is going to have the same ideas about the world that you do? It's basically the same concept here. Different races will have their different viewpoints: as unique as anyone's character is, they're going to have at least a few conceptions in line with members of their fellow species. Considering there aren't many Nep females out there, it'd be hard to use those thought patterns, and that's the crux of the matter.
I'm a bit worried that you don't seem receptive to advice. You should take the others in this thread more seriously: they've been here longer than you and they know what they're talking about. Maybe you should actually consider their advice, as it comes from experience. Stubbornly refusing to listen until the admin comes along to agree with you just makes you look immature.
Don't get me wrong though, this character does look interesting, and I'm interested in seeing the skills. Should be fun to play, and I wish you luck with her.
I'm pretty sure others have posted by now, but basically, whatever Thomas said is probably right.