Kalista Mobility Tax
I think she should be swapped over to an energy based champ and make her jump drain energy in small amounts increasing with each successive jump. If she bottoms out give her a buffer time were she switches over to traditional auto attacks until she regains 25% energy. It would make her more skill based, having to manage your mobility more carefully. Kind of like rumbles overheat.
Edit: Obviously she would need some numbers moved around to compensate for the resource change.