I absolutely believe you could have MS (or a facsimile) from exposure to AO. Years ago when I first got MS dx, I read loads about people intoxicated with AO. As for herbicides, they are one of the very worst thing for causing people to become active with porphyria. DDT is probably the least dangerous one...lots of others which are extremely bad, including the products everyone uses in their yards. This may indeed cause MS or its facsimile. In my opinion. Whether or not this doctor's zappers do the trick, her pinpointing AO exposure is probably right on the money. You and your mother have told the whole story in great detail of how you got exposed.
Whether or not this caused MS, don't know for sure, but I do not think this is wasted money you are spending. Sometimes with a "natural" doctor we hit the jackpot. I am just astonished that this problem was not pinpointed before!
Those of us who have porphyria are more likely to seek information on "what poisoned us". As I just posted on another thread, a few years ago there was a discussion about some MS being autoimmune and some being from chemical toxins. Mine, I believe is from chemical toxins. Maybe yours too. Bull's eye.

I had my first attack of "whatever" at Stanford when I was exposed to the following suspects: 1. Formaldehyde used in the Biology lab. 2. probably grass exfoliant used in the very high dry grass behind the idyllic dorm (sarcasm intended). 3. mold and mold reducers used on the interior carpet 4. poor food which was high in salt and grease.
My father sent me there by working a second job for 17 years. And that's what I got when I arrived. However, I
am not as mad as I sound, concerning my personal results, because this is pretty common, in my opinion. The majority of people may be able to detoxify all of these things, so that those of us who do not properly detox, and are overwhelmed (as I was) by multiple toxins, may come away changed for life. I was NOT a hypochondriac as implied.
The doctors just didn't know anything. At Stanford. THEY DID NOT KNOW ANYTHING. Yes, I needed a specialist, perhaps, but no one told me to go find one in town, in Palo Alto. I am glad I am smarter than they were even though it hurts a lot to realize what lazy hidebound unmentionables they were. I was only 17 and very naive, although in the top of the Freshman entrance group. I didn't know I needed more help than the Health Service provided, and I thought they must be right that it was all emotional. And to this day they probably never figured out those things, as they applied to me or others who came along. They are NOT a great university, not in that field.