Her husband had horrible headaches, maybe sinusitis, not sure; now he has very painful shingles which may have an autoimmune issue to go with.

She said, "My husband has NONE of the symptoms you describe; and he has never been exposed to 2-butoxyethanol" How does she come up with that? He was an airplane mechanic and painter, too, before he recently retired.  I think he even built his own home. They both clean a lot; and she admits that she regularly sprayed Simple Green on his work clothes before washing them.

Her dad and her mom had serious fatigue issues that may be the same same ... but guess what? the dad is blamed for smoking or other 'it is your fault type of blaming'

No; so I'm not telling her what I think (including the time her system went whacko and the doctors had no clue. (Second hand solvent exposure when someone hung out at the fair booth she was manning last summer.) There there is her friend who died of ALS ... & who was blamed for that somehow, but not the chemical that most probably caused this ADVANCE autoimmune issue.

Early on were there fevers ... high blood pressure?  high blood sugar?  NOW is there a subnormal body temp (less than 98.6 degrees)? ... is there LOW blood sugar? ... LOW blood pressure?

Has there been significant eyesight loss somewhere along the way?  ... Memory loss?