This is pure speculation on my part, but I think she will have the same power level.
Apocalypse made it clear that he simply is unlocking her "true potential" allow her to access the full rage of her powers; somehting she would have learned eventually.
She clearly was inexperienced in the market space trying to summon the wind, and after Apoclaypses death, she was able to access Lightning in the danger room: therefore I don't think Apocalypse death removed the "upgrade"
Peronsally I hope they maintain the more "unrelatstic" aspects of her powers in apocalypse: traveling down the lighting bolt and holding back Scotts beam.