Law Question= Law- Forum Member Rights? Banned member wants the threads she published

[hyperviperx99]

I own a forum website where registered members can post their creative writing works, and I banned a member recently. Now, she messaged me saying she wants to have all the threads she posted deleted. Those are her works, but she was the one who posted them on my website. Could I get in trouble in USA's law if I don't delete them? Or do I have the right as the website owner not to delete them since she was the one who published it herself? Does it violate copyright laws? Please let me know.

When one registers in my site, there's a check box they have to check before they can be registered and it says, "The owners of FlipRap Arena reserve the right to remove, edit, move or close any content item for any reason." and she did this for her to be registered before