I find the Ballistic Fist is a pretty good choice. Providing its in good condition, she makes short work of most enemies with it. As for ranged, I usually give her a plasma rifle, specifically the Q-35. It only uses one ammo per shot so its not too hard keeping her stocked up with MF cells that way.
For clothing, its got to be power armour all the way. Its easily found and, being a melee/unarmed character, she needs to be able to take some damage against the tougher enemies. Also, shes from the Brotherhood or Steel, its what she should wear.