I believe I can help you with your concern
Give me a couple minutes to look over your question, so that I can give you best advice possible.
May I ask, is she overly concerned about her physical appearance at all?
And does she appear overly dramatic at all, with exaggerated displays of emotion?
I think your fiance may have a personality disorder called Histrionic Personality Disorder, where she over-exaggerates her symptoms. She may have a mild depression, but this is compounded with her personality disorder to seem worse to her. Also many individuals with this personality disorder crave attention and will use illnesses or mental health disorders as an excuse to get that attention.
Here is a link explaining this disorder in more detail for you
Well for this disorder, there are no magic pills. She would require weekly therapy typically in the beginning. Usually the best type of therapy for this is called Cognitive Behavioral Therapy (CBT) or Dialectical Behavioral Therapy (DBT).
Here are a few books that can help her though
Well ignoring her would make her seek more attention from somewhere else, so ignoring usually does not help. She has to change her thought process to be more objective and positive, which these two types of therapies can do. This is a serious disorder and it can get worse over time, but with the right treatment there is a high probability of success.
Well I think you should push her to go to weekly therapy, convince her that a therapist is an ally and can give her the attention that she wants.
So I would not use the personality disorder outright and tell her this, but gently push her into therapy
Anytime, is there anything else I can assist you with?
I am not entirely familiar with naturopath approach, but some homeopathic remedies can help like the use of St. Johns Wort, Omega-3, Glutamate, Valerian Root, and 5-HTP all can help her symptoms. Also meditation and acupuncture has been shown in some studies to relieve her symptoms as well. I still think that the CBT and DBT therapies are more effective because they are gradual and changing her thought process to be more objective and positive, and they have no risk of side effects like medications. So I see no negative side in seeing a naturopath at all, but again do not expect miracles because a personality disorder is usually very ingrained in the mind at takes time to "cure"
Anytime, I am always happy to help. I hope your fiance gets better soon. My goal is to provide you with excellent service, so if you ever have any further questions or concerns please do not hesitate to contact me at anytime.