Hair issues are a bit tricky & the best of dermatologists' have to see the patient & asess him/her before treating.
I suggest that you get a second opinion
as to the reason behind the hair fall; if the second dermatologist concurs, then please ensure your wife sees a psychologist
as often it is a cycle..depression
vs hair fall...which came first? the hen or the egg?
Off the cuff, please use the shampoo only twice or max 3 times per week.
Avoid excessive handling or combing & use of brushes..use a broad toothed comb.
Hair loss of upto 100/day is a normal phenomenon. Be supportive of your wife, take her on a holiday. Often when the mind is distracted, she will forget her woes & the hair loss will not be magnified!
Use a 5% minoxidil
or nanoxidil lotion on the dry scalp
twice/day for a month or so & then re-assess.
Good luck. Hope the suggestions i have given stand you in good stead & wish you & your wife good health!
Dr Praveen Rodrigues MD
Vikram Hospital, Bangalore, India