Planning to limit the range and give her side-effects for going over it yeah. In other news, after a bit of research, the force I'm thinking of is probably momentum, not friction. Friction wouldn't let a person run up a wall since the collision between a foot and a wall creates momentum moving away from it (think when you throw a tennis ball at a wall and it bounces off), and preventing the collision (what friction does) would essentially mean nothing is keeping her foot on the wall, so to speak. Which, after a few steps, she'd get pulled back down by gravity. I'm gonna sit down and figure out exactly which part of physics I'm fucking around with here, then rewrite the Quirk once I've got that figured out.