Hmm. Maybe it'd be easier if I just make her into a hunter. It'd give her the right skills I want with a more reasonable backstory. 

I would like to ask though, how "realistic" will this to be? Because when I played Oblivion I did just fine sneak attacking everything with my dagger. I understand that this isn't a game but at the same time I don't want to end up having to carry a long sword and decked out in glass armor just to keep up at later in the story. I'd hate to have to be shoehorned into a frontline fighter, never being able to utilize stealth, or for everything to be immune to poison.