From the descriptions of your wife, she behaves in a very similar way to mine, except my wife started this behaviour in her late 30's/early 40's. Its been about 10 years of virtually no interest in sex and a declaration that she doesn't want to have any interest. By way of reference, she was a very sexual and fun loving person prior to her late 30's. She was always in the mood and was constantly initiating our sex life and was a hell of a lot of fun to be around.
Anyway, we go to the same doctor and so I asked him if he could convince her to take a hormone test, which she ultimately agreed to (because the doctor recommended it - I would not even contemplate bringing this up with her directly in the first place). Sure enough, her hormones were out of balance which he indicated to her would appear to have created both the mood and the desire problem (ie constantly in a PMS state and always hostile to the possibility of being sexual). As it turns out, she decided not to take any kind of hormone or other kind of herbal therapy as she believes that any of these substances do much more harm than good. She would rather be in her current state than risk any problems with a "remedy".
I don't believe that she has any ability to change her mood or lack of desire until her hormones are more balanced, but she will not try to balance her hormones so we are stuck in a rather miserable situation.
In your case, your wife's hormones may also be at play and may have gone out of balance with the birth of you child which I gather occured right after you were married. I also understand that there was a total change in her desire for sex right at that time and there has been no further change for 15 years or so. If you go to the same doctor, you could try like I did to have him convince her to test her hormones and suggest a therapy. Perhaps, unlike my wife, she may be willing to look at the options which could result in a change in both her demenour and her desire for sex. Anyway, just a thought and probably a long shot, particularly if she would never consider a medicinal intervention to the situation. Please also note that I have no medical background at all so my views are purely from reading numerous articles on the many forms of sexual dysfunction.
