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I agree with what Mark Baker said, but you might want to consider the following. If she said it is your intellectual property, that suggests you still own the copyright and you didn't give it away...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27023 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I agree with what Mark Baker said, but you might want to consider the following. If she said it is your intellectual property, that suggests you still own the copyright and you didn't give it away. However, you can't just copy what is on the website because they have added to what you supplied (font used, heading colour, etc.). But if you are writing a book, you won't want something that is exactly the same as you would find on a website. You would want it formatted differently and you would change at least some of the text. This would mean that you are not reproducing the article, you are reusing the ideas, which you supposedly own.