The Juggernaut fight in #217–218 is a good example of how much more there is to her than the disco image.
She throws a tremendous amount of power at him. She's able to make it a real fight, but doing that takes a lot out of her, and Juggernaut is still Juggernaut. This isn't a case of Alison suddenly becoming physically stronger than him.
There's also the fact that he's a fan of her music. She's trying to deal with this ridiculously dangerous man, and he knows her as a performer. Her old career keeps turning up in the middle of the superhero life.
Rogue is involved in this stretch too, so Alison is having to depend on somebody she once had every reason to distrust. Their relationship has to change through those situations. They can't stay stuck at the point where Rogue was attacking her and still function as teammates.
The Juggernaut fight in #217–218 is a good example of how much more there is to her than the disco image.
· Comics / Marvel / X-Men