I say nay. Fighting games never helped me win a fight, the fact that I shoot for the groin and kidneys did. Shooting games didn't help me shoot a gun any better, although I will give a point to the 'yay' side since it helped me with my steady hands and paranoia for aiming down a sight.
But other than the added hand-eye coordination, I don't think she really helps at all. Oh well, back to shooting zombies...