Trick Shot would be a must for her. This will also allow her to carry around a Hand Ninja as a human shield while modifying her AV. If she takes a solid hit she's done though, but she's always managed to dish out just enough for me when needed.
Unless it's late in the game and you really need to base somebody with her, keep her 8 squares away on hindering terrain and blast people!
On hindering, her defense is 20 with her Energy Shield--and even if that's outwitted, it's still a respectable 18!
She's top-heavy, but she's still a great figure.
I wouldn't waste points on feat cards for her, but if I did I might use Force Field to give her 4 clicks of Toughness for 10 points.