She has a nice voice, is young, and brings something new / fresh to an industry that's been heavily dance pop/edm for the last 4-5 years. Feel free to dislike someone's music, but to discredit her entirely as an artist is totally unfair given that:
1) Nearly every artist nowadays have their songs written for them. Even then, her music stands out to a lot of people and she has said in several interviews that the writing is usually done collaboratively between the two.
2) Her voice is technically trained and she has a large vocal range. Just because you don't like it doesn't mean it's "not good" especially given how young she is.
3) What does "go to college and get a job" even mean lol... she's far more successful than 99% of people that do go to college and get some random office job will ever be(not to mention I guess being an artist in her teens doesn't count as a "job"?)
I think you're grasping at straws to hate on someone for being successful at a young age. I mean, again, you can dislike someone's style of music / personality or whatever, but your entire basis for discrediting her talent seems to revolve around her music not being your taste and being young.