maybe she'll come ( as tradition )
or not and the only time i think she can make her appearance is after the kalos league , maybe to battle ash's noivern or just like that.....exploring
I doubt she'd come back only to battle Ash's Noivern, although perhaps she would just come back to explore Kalos. Still even in this case, she likely wouldn't stay long cuz there's other stuff happening that take priority hee hee. ^^;