What about... would you want to continue the concept of her fusions having Mega Stones for their gems?

If we went for these two fusing, Audinite or Diancite could be cute... or we could go for one of the Charizardites, because FIRE and flying and if that aesthetic carried through at all, it could be downright hilarious. (Or Venusaurite, because flowers. And also potential hilarity.)