The simple answer is that she and her protectors (white knights) are many and they're a pain in the ass to deal with.
I should note that she is nice enough to submit a copyright notice quickly too, so they're taken down quickly. They hit every site that her content shows up on quickly too. There's always a white knight that will report to her when they see her content go up in a thread. While she's pretty, her content is PG, so find her on twitter and enjoy it because her pay site isn't much different except for sets of her in cosplay. There's no hope for her ever posing nude or a nip slip either.
Cheers!