Thanks for the query.
The hair cycle normally consists of growing, resting and falling hairs and there is a delicate balance between these stages of hair cycle. Normally hair should regrow but if its not happening, you should consider seeing a dematologist.
Further information is in the following weblink
Female pattern hair loss is an increasing problem in today's society. The treatment typically consists of usage of oral biotin and topical lotion (Minoxidil ). The dosage and duration is decided by your dermatologist. You need to be patient with the treatment protocol as it takes months to see initial improvement. Certain dermatologists supplement biotin, hair serum and advice procedures like PRP therapy which may accelerate the rate of hair growth. PRP needs multiple sessions roughly at 6 weeks intervals. PRP therapy is increasingly being accepted by dermatologists all over the world.