I'm going to stick to my daughter's grounding
What did your daughter do to deserve a grounding?
She tried to pass off poetry as her own when it was a rip off of Ezra Pound's.
I'm sorry you were so offended by her poems, and in your house there are boundaries. She should follow through as long as she is in there, and you are right for letting down the law. If you just let her do whatever she wants then she might turn out badly.
It's your fault. You are the one who told her to write those types of poems.
Kids can write poetry if they like but you should teach her that plagiarism is very wrong. If she does this in highschool or college she will fail a class.