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Pattern of hair loss of your daughter might be a condition known as telogen effluvium
. It may be due to
1. High fever/ surgery/ acute illness 3-4 months back
2. Altered thyroid
3. Anaemia/ Deficiency of vitamin/ minerals/ nutrients
4. others undefined causes
To identify causes and to treat accordingly you need to go pathologist for several blood and hormone test.
For hair regrowth you need to apply Minoxidil
2% lotion/ spray twice daily as per manufacturer's advice.