Hi, I'd like to help you with your question.
The best option for your friend is to seek out treatment through psychotherapy and possibly medication. However, your friend needs to see her hoarding as an issue before she may be willing to seek help. Commonly, people who hoard do not see it as a problem and therefore do not feel they need treatment.
You mentioned that you tried talking with your friend. Since she is in denial, you may want to try again with her husband. Spell out how the hoarding is affecting her family, her marriage and her social contacts. Do it in a nice, even tone and don't accuse or do anything you feel might make her defensive.
If you can get her to go to therapy, offer to go with her the first time for support. Or her husband may want to go.
Since hoarding is just becoming recognized as a disorder, possibly set apart from Obsessive Compulsive Disorder, treatment is still difficult since there have been few studies on what works and what does not.
Here is a book that may help you. It is called Digging Out: Helping Your Loved One Manage Clutter, Hoarding, and Compulsive Acquiring by Michael A. Tompkins and Tamara L. Hartl. Amazon.com has it or you may be able to find it at your local library.
I hope this has helped you,Kate
Outpatient CBT would probably work best at this point. It also would produce the best results in the shortest amount of time.
A Master's Level therapist is a good choice for her. That is someone who has a M.Ed, M.A. or MSW. A Psychologist is good too. That is someone who earned a PhD in psychology. A Psychiatrist is a MD who specializes in medications and sometimes does therapy for patients. Unless the therapist feels she needs medications, a psychiatrist is not needed.
You can talk with the therapist about hypnosis, but it is not necessarily a treatment that works for something like hoarding or OCD. Individual therapy with CBT would work just fine, if not better.