Just FYI - I had a difficult birth also, 4 days of hard labor (so I am told because of course I don't remember :>) And I had a lot of alergies growing up - spend a couple of months a year in bed. then from about age 18 I seemed to have a relatively normal system - no alergies, no health problems.
My Psoriasis only started to flare post menopause. I had just moved to Queensland (Aus) and my kids were down in Sydney. It might have been the stress that started it, or changes in the physical environment. Antioxidants often help. My most recent flare was from prescription meds, a cocktail that made me very toxic. This was a real crisis for internal organs and for my skin. Thought I might have to go into the hospital just for the psoriasis.
This is day 21 for me. (For you too isn't it?) And I am amazed at the benefits. Hope your friend sees 'the writing on the wall' and decides to give it a try!