And then I'll have to wait for one volume a year, according to her website: three more volumes, coming out 2014 - 2016.

I believe that's the number of volumes she's under contract for right now, not necessarily the end of the series, so only the end of the series if her publisher doesn't sign her on for more. (Last I heard that was definitely the state of things with the InCryptid series, where she's currently under contract for five books but has at least ten planned.)