Also I think a VV device may be a bit much for her, but at most something like a spinner ( mines as big around as a vivi nova, is the smallest one the same diameter as a kgo? )
I asked because My Vapor Store has a kit with 2 joyetech Twists or 2 Vision Spinners (or one of each) that comes with a choice of toppers. Since you already have eGos for back-up it crossed my mind they you could share a kit and each have a VV. Their Protanks are about $2-3 more than you can get elsewhere, but if you add a couple of things to the kit order you can get free shipping:
http://www.myvaporstore.com/Vision_Spinner_Joye_Ego_C_Twist_Combo_p/vvs-c.htm
It's probably not what you're looking for, but it crossed my mind.