These cameras are just fantastic.
They also offer great opportunities for the happy snapper to grow as a photographer and learn to exercise more control of the shot.
I would only suggest a larger sensor camera if she has definitely shown dissatisfaction with the noise at high iso in a similar size camera -- even then, if her current camera a few years old, recent model cameras do a better job.
With my wife, she loved the handling of a Nikon P500 superzoom but hated the image quality, so I stepped her up to a Panasonic G3 micro four thirds. Now she hates the lens swapping!
She likes a bit of reach so the G15 or G1x are out, so my only thought is a 14-140 lens for the G3. Which is expensive.
So, maybe get clear feedback on what she wants (explaining there ARe compromises such as size, weight, interchanging lenses etc)