The main thing I wanted at that time of my life was a mother-figure who I could talk to about the things going on in my life--like Saint says, trust--about dating, about future plans, stuff like that. Someone who I could ask about her personal experiences and I could trust her to be honest without being preachy. Someone who was an example of a functional family/functional interpersonal relationships.
But given how you've set up the Keepers and the whatchamacallit people they're a part of, do they have families? I do want Vin to be able to grow in the realization that not everyone is like her brother--that even though he didn't abandon her, he also didn't treat her the way she deserves to be treated. She's starting to realize this in the first book, but I think she still needs to see it in example not only in the boys' club of freedom fighters, but also in a family.
She also needs to learn what it means to be a strong, vibrant woman in her world--which may or may not be the same as one in our culture, of course. She's learning to act like herself in the first book (one of my favorite parts of her development, by the way, as it is something I often struggled with growing up, knowing how to just be *me*, not what others expected of me), but do you feel that development is complete? Will she continue to have others who expect her to act in certain ways? That sort of thing.