I personally have not read her book, but I did see some of her Youtube videos back when I was preparing for the exam earlier in the year. I found her presentations in those videos to be helpful and easy to follow. Aileen broke down the concepts in much simpler terms versus the way they were presented in the PMBOK and the "Rita" book.
Training for Project Management Professional (PMP)®, PMI Agile Certified Practitioner (PMI-ACP)®, and Certified Associate in Project Management (CAPM)®