Hello Mr.Kumar ;
welcome to HealthcareMagic
can be due to many reasons like anaemia;thyroid problems;deficiency of vitamins and minerals;dandruff
and infection of scalp;after fevers like typhoid;malaria etc.So it is important to find the cause and get treated.The most common thing in female can be anaemia due to blood loss during periods and even vitamin deficiency
so please tell her to get tested CBC to see if she has anaemia and then she can get prescribed iron tablets and multivitamins and calcium tablets.Also get her to a Dermatologist
(skin specialist) if the hair fall does not stop to find other reasons and then he will treat your wife accordingly.As for the period of menopause
it can continue for 2-3 yrs also so keep proper follow up with your Gynaecologist.