Love this topic, and hope things work out for Rachel. I had a partial healing from CFS myself twelve years ago for about two years, and that was very important for my business. When the healing left and the CFS returned, I was able to survive and take care of my family because of what I accomplished in those two years. Being a family breadwinner with CFS really stinks.... I don't mean to cast any doubt but hope that Rachel makes wise use of her time of better functionality, the future is hard to predict even when you have experienced a healing.
My two bits, the truth is that ANY healing of someone with CFS is somewhat miraculous. I consider science to also be quite a modern miracle, but so can be all other types of belief systems.
Science is a belief system based on an empirical philosophy.
Atheism is a belief system based on skepticism and sometimes cynicism (except 'positive atheism' which I have high regard for).
Religion is a belief system based on traditions surrounding lived spiritual experiences and social concepts of ethics that have been developed across the ages.
Medicine is a belief system based on faith in drugs, vaccinations and surgical procedures.
Every approach someone takes to help ME/CFS sufferers will have an element of belief and faith. In my experience there is more failure than success in all forms of CFS therapies so any success should be celebrated.
Note that Rachel says she was a 50 and is now at 90 on Dr Bell's scale. This is not as dramatic as what happened with Mike Dessin who was about a 10 and is now at 90. Both are miracles, one was based on faith and prayer and one was based on an intuition-based homeopathic type of neural/detox therapy. But both involved some appeal to a higher wisdom, even if it was subtle.
There is no doubt in my mind that there are many things science does not yet understand, which probably includes some mechanisms that at times work without visible means. Here is an interesting story, I have a friend who is a very gifted Reiki healer. She uses a type of New Age Christian approach to Reiki, 'pulling energy from Jesus' an that worked for her. Well, she had a serious mental health problem and during that time became angry at God I think, she became an agnostic, actually almost an atheist, she lost her faith entirely. So no more appeals to God, but she still could have the same level of success with her Reiki, still could heal people just as well! Later she got medication that worked and over time as this problem was solved she became a believer again, and now she is back to a Christian approach to energy/faith healing and that works too. [note, I am just telling a true story, not making any point about belief failure and mental health]
My personal view as a scientist? There are many things we have yet to learn, I have seen these types of healings also, for other conditions, and they are real, regardless of how skeptical some people may be, I have seen them and they are not coincidences. But as a scientist I believe these are real physical phenomenon that are simply so subtle that we can not see the mechanism (although feeling a heat is close, many people experience that also in Reiki and other types of energy medicine). What people think and believe and how they pray and intend feelings has some real physical effect in this universe. Someday this will be 'discovered' scientifically, in fact every discovery science will ever make, from now to eternity, already exists. So think of how much there is yet to discover, and realize that all those phenomenon are already present, we just do not know about them yet. The earth was round long before people realized that was the case. Forces of nature such as electricity, magnetism and gravity exist even though they are invisible and we only see their effects. There appears to be some type of invisible spiritual reality and there is evidence of its effects in the fact that sometimes people are healed without explanation. The fact that experiments fail to detect this phenomenon at this time does not disprove its existence (see Carl Sagan on that topic). If there is intelligence in that spiritual reality perhaps it has some opinion about when and how it will allow itself to be measured.
"There are more things in heaven and earth, Horatio, Than are dreamt of in your philosophy." (Hamlet)