Bob,
I know this experience is difficult. My parents are near 80 and my dad is showing some very early signs of Alzheimers/demetia, etc. I can see how much this is affecting my mom--adjusting to this after 60+ years of a great marriage. So, I can imagine how you might be feeling.
I am a care giver for my wife, age 53, who has HD, so I'll tell you a bit of what I tell my mom and how I respond to HD.
First, whether your wife is in denial or not, she needs a very good doctor, who knows about HD. Initially, my wife did not want to see a doctor, but I had to be VERY firm with her. If she would not see a doctor, I would not be able to help her. That is a fact. I highly recommend looking for your closest HD Center of Excellence, and hope they have a clinic that you can visit with your wife. At some point, you are going to need help at home, because HD will wear out even a young person. I have a psychiatrist for my wife, and I highly recommend one. Without him, my wife would be miserable and it would almost impossible for me to care for her. A psychiatrist can prescribe medications that help stabilize your wife's emotions and reduce her movements. You do not have to tell your wife you ar taking her to a doctor for HD--just get her to a doctor.
You need to understand that many things your wife does are not really her, but HD affecting her. Try not to take it personally. She cannot control much of what she says or does. From my experience, the ONLY way to control difficult emotional issues is through medications.
When HD started, I remembered the Marine saying, "...when the going gets tough, the tough get going..." I have to make some very tough choices, but someone has to do it--and I guess it's me. Feel free to e-mail me at home davekendall1*at*yahoo.com. If you want my home phone number, just let me know.
Best to you.
Dave