My girlfriend writes a lot of fanfiction, can I use her writing prompts to write original stuff?

I want to be super clear I’ve talked this over with her extensively and we’ve come to the mutual agreement that yes I can. However I’ve been banned out of two writing groups on Facebook and I was considering posting here for feed back but I’m super nervous I’ll get the same reception. <br><br>Her writing prompts are extremely in depth and detailed, I’m in the process of writing a book now using one of her prompts and it’s going very well. I’m worried that this is somehow frowned upon in the writing community.<br><br>For context, we’ve been together 9 years, she is unable to write original works because of her disability, and she is aware that I’m using her prompts.