Chopin, Beethoven, Rachmaninoff, Mozart, Liszt, Grieg...
Sure, she has a decent voice; not one-in-a-million, hell probably not even one-in-a-hundred (one-in-ten, maybe?), but her "music" is pretty much the same recycled garbage one has come to expect from the pop music industry - more of the same. Hell, the only reason you are hearing her songs instead of some other random girl is because she just happened to be in the right place at the right time.
There's no issue with you liking the music (to each their own, right?), but to honestly consider her "brilliant"? Even "talented" is a stretch for this one. I will concede that she does seem to have excellent charisma and stage-presence, but that pretty much comes naturally to anyone nurtured by Disney since they were 12 (as well as to daughters of celebrities). In closing, she is nothing new, nothing different and nothing remotely worth taking note of.