I'm mexican. I wrote a Book based on my ex gf's idea for a character. She did not write a word on this character, she just gave me her idea and so i made her the protagonist. She gave me her name and a basic, barebones concept of a backstory. Really the only thing she said was "This is her name. I imagine her being someone who escaped a lab, and now a sort of company is hunting her down because of her powers".

So i wrote a book based on this while we were still together, but she didn't write a single word on the page, nor did she help with the story structure. She did help me read the book to find mistakes and point out weird story beats, but she only ever gave me her opinion and so i adjusted things to better fit the story.

The book is out and well, we're not together anymore.

Inside the book i thanked many of the other people who helped read the book to find mistakes, but i wrote a whole paragraph for her, acknowledging that, in fact, the idea for the book came from her. And now she is telling me thatthe character is HERS, that she made her, she created her. Which is not wrong, the idea is based off of what she told me, but, i mean, i Literally wrote the book myself and never copied or used a single word of whatever she wrote because, well, she didn't write anyhting at all.

Could she get me in legal trouble for "stealing" her character? A character that, mind you, only was her idea, but was never even registred.