As someone who has come late to WTM, I have used WTM mainly to inspire my curriculum building and to find resources. I used to teach college writing and after having two homeschoolers in my freshman composition classes, I was convinced to homeschool my daughter. WTM is a great curriculum for preparing students for college, but there is no way we could follow it rigidly. My daughter's passion is also history and literature, so I've crafted a "History in the Round" curriculum that has her reading the history of Western Civilization, art, science and women. The literature selections match the history chapters (Old Testament, The Illiad, Canterbury Tales, etc.).
She's also taking Latin, because she plans to learn other Romance languages and it will help her understand English grammar better and help increase her English vocabulary. Logic and critical thinking skills are important across the curriculum, so she'll be working on those from here on out. I would say it's okay to pick the aspects of WTM that are important to you and merge it with your daughter's passions. There are only so many hours in a day, and I've had to back off on some of the academics as well to actually give my daughter the freedom that homeschooling is supposed to give! Allowing time to stare at the clouds is equally important in developing a well-rounded student.