Then I guess, by your definition, Robert Plant is not a real recording artist either. He never wrote any Zeppelin song by himself either, only with Pagey, JPJ and/or Bonzo.
If you hate her music, that is fine - but as an artist she has much of the control of where her music goes and the producers say that as well. She usually comes up with the basic melody and the lyrics herself and then works with the producer or co-writer to finalize the product. It is no really a collaboration with her and someone else, until she brings it into the studio to be recorded. At least that is what I read in the articles that are out there.
RedOne said that she wrote most of the hits from The Fame in a matter of 5 days, when they began working together. Anyways, not trying to convince of anything - just trying to give another side to your post.
Peace.