How far in advance does Richelle Mead generally release the first chapter of her books?

So, I've been exploring this site and I've found that apparently Spirit Bound's first chapter was released around December, but the book didn't come out til May.

On Richelle Mead's FAQ it says she releases the first chapter 30 days before the book comes out.

I didn't start this series until after Spirit Bound came out. After reading it I looked for any info I could find regarding the new book and I found out about it and the spin-off series. I then found out it's release date was Dec. 7, 2010, so I started looking for info on when she posts the first chapter.

I found the info about when she releases the first chapter on her site faq and assumed we'd be seeing the first chapter around the first or second week of November, but today I came across posts from 8 months ago about the first chapter of Spirit Bound being released and that it was out apparently in December. That's way more than 30 days before the book was released.

I guess my question is ... is that normal for her? Does she usually post them four months in advance or was Spirit Bound an exception? Does this mean we could potentially have a chapter any moment?