The first thing to do is eat the way humans should eat. This is unequivocally a natural (ideally wild, but organic is a good substitute) carnivore diet. It's not popular. It's not what people want to hear. But it's the truth. All my athletes saw huge benefits from going carnivore, and it is known to have cured people with arthritis, depression, autism, schizophrenia, multiple sclerosis, and almost every other ailment in existence.

The second thing to consider is the milieu theory. u/Tom_Bombadil is or has been recently looking into the milieu science of health, which is opposed to the microbial theory of health in that it considers that the state of the organism is more important than whatever microbe one might or might not have in them. This has humongous implications for the entire health picture and process.

Pasteur, on his death bed, said "Béchand was right and I was wrong for most of my career: the milieu is what matters and the microbe is unimportant." As such, she must look into potential toxic elements she may have acquired, such as a chronic poisoning through gut disbiosis, mold infestations, amalgam fillings (removing these is ESPECIALLY risky) for mercury poisoning - which she might have swallowed in part at some point in her life, adjuvants in vaccines, etc. The number of potential toxicities is humongous. Getting a hair sample tested for toxic and healthy mineral levels may very well be the best first step on her journey to getting better.

In closing, some people have improved their health even with stuff like multiple sclerosis using massive doses of toxic chemical antibiotics. This seems to fly in the face of the milieu view of health, although it does not: the milieu is the determining factor of health or disease, and microbes play a thoroughly secondary role. It is secondary but not irrelevant at all, however.

Anyway, getting rid of microbes can be helpful while she gets her milieu straight. Once the milieu is good, just ask the Chinese: you won't get sick, no matter what hygiene you employ or not. Anyway, instead of toxic chemical antibiotics, I use colloidal silver. I make my own, which makes it cost roughly 10 cents per $100 of commercial colloidal silver. The US$120 for the generator has paid for itself a zillion times over.