From the description provided, it seems more like alopecia areata
. It is an autoimmune disease
which causes round coin shaped lesions of hair fall which may coalesce and progress rapidly to cause hair loss extensively.
As she is having extensive hair fall, she might need a course of oral steroids. Another option could be contact immunotherapy
with SADBE or DPCP. Kindly talk to a dermatologist
near by for these treatment options.
Hope that helps.