I love her but she doesn't really have the voice for it. That would require hours and hours of vocal lessons and with an upcoming era I just don't see it happening.
She needs to concentrate on making a quality album first. Baby steps.
OT: I love her but let's be very honest here. Katy Perry is a good performer, with the props, the hits she has, the lights, the sounds, the left shark, etc. But she is not a good vocalist, at least she is not in capable to do the NA at the damn Superbowl. If yall wanna her to get dragged, then sure.