I have two suggestions.
First, a maltreated child has missed many important developmental milestones and has not received what children raised by healthy parents receive...so like a person starved, they need what was not gotten. So, I'd keep her with you and at your side, like you would with a toddler and provide lots of affection, nurturance, and structure.
Second, I strongly urge you to find a professional with real experience and training in working with adopted and foster children and with attachment issues. you can find on in your area by going to the ATTACH website,
www.attach.org
It sounds like your initial instincts are on target...provide her what she never got and help her grow up, developmentally.
Regards