There could be several reasons. It's likely that your naturopath and your sister's have taken different approaches in their practice. Naturopathy is eclectic, and not all practitioners use all of the techniques. Another possibility is that you and your sister have different lifestyle issues. One of you may be under more stress or smokes or eats less healthy food. Such factors are more important to the naturopath than just the symptoms. If you are concerned, discuss the issue with your naturopath.