See, I disagree, since her lighting is also pretty powerful TK, capable of throwing people around pretty hard. In an arena fight, she just picks him up and slams him repeatedly against the walls of Khazan until he passes out.
Also, for the fight, once the three girls were there, she did more damage in each of the admittedly-very-few shots she landed than the girls did to her with their many more. There was some blood, but no real impact on her function. What I was speaking of is that her hitting power was higher than the girls, and the girls include Maeve, who has some pretty salutatory strength. And she did jut get up, every time. It's just that each time there was another girl waiting to cold-cock her from an angle she wasn't looking at.
Stormfront's durability doesn't matter, however, since Colossus can't get to her here, she'll just hang out in the air and either shock him or TK slam him over and over and over again against the unbreakable walls of the arena.