I've listened to and even enjoyed a bit of her music, but honestly, I don't see or hear anything about it that makes me think: "this is going to stick around a long time." It sounds much like the other fare out there right now. Artists that last a few years at most, then get married, make some kids, disappear, then try to make a comeback too late, and are yesterdays news.
The comparison with the Beatles and the like is a weighty one, and i don't think the two can be classified anywhere near each other, personally. But that reminds me of a few years back that someone, somewhere publicly made the comment that Eminem was going to be the next Elvis. Yeah, whatever.