I would recommend that she try muscle trigger work. It is non-invasive, very applicable for Chiari folks, free, and you can do it yourself. It muscle triggers are what ails your friend that that is a sound route to try. She could buy a book designed for lay-people by Clair Davies, titled “The Trigger Point Therapy Workbook”. It is designed for a person to look up the sore body parts, it lists muscles that can affect that area through referred pain patterns, then shows a person how to work on those muscles. Start gentle!
Now, having said that, if your friend is too sensitive to tolerate touch, she will need to do a different therapy first and then come back to the muscle trigger work… This is what I had to do. To desensitize the head to touch, movement, clothing, and hair do-dads, graded motor imagery (from NOI - Neuro-orthopedic Institute) works very well. It takes multiple sessions daily for a few months but does wonders to rewire the brain so that stimuli to the head that regular folk feel and perceive as no trouble becomes tolerable to the Chiari person. That Chiari brain is wonky!
Graded motor imagery is a treatment used with good results for amputees with phantom pain and people with Chronic Regional Pain Syndrome. All three deal with a brain that is having difficulty processing body stimuli and turns it into pain. Of course, your friend will have to have some buy-in for these therapies to assist as a willing participant is necessary. Also, I have found that if a treatment or therapy approach bothers me more, I know that I am on the right track but have to find a level of therapy that suits what my body and brain can handle, not what someone else (or even myself sometimes!) thinks I should be able to handle. That adaptation to therapy progressions can be a challenge with the Chiari client.
Hopefully your friend can find the strength to try something new. It can be very challenging when your world is so small and painful to have hope that something will help. I know that I have taken many baby steps to get out of dark places.