Hi Ankita,
First of all, there is nothing to panic losing upto 100 hair a day is considered everyday

Absolutely right! Normally, losing about hundred hair a day is considered average, and this could be during the process of washing and combing. Anything above that would be considered excessive hair loss.
There are plenty of reasons why there could be excessive hair loss and children. some of the main reasons are as follows:

• Tinea capitis which is a type of ringworm can affect the scalp and lead to hair loss. If your daughter has lost hair in patches, chances are that it has been caused due to this fungal infection. If this is the condition, then we would generally recommend an antifungal medication and a special shampoo, which will have to be applied 2-3 times a week.
• Alopecia areata would mean that you would notice the sudden appearance of completely bald patches on your child’s head. There would be no inflammation or scaling and these patches could appear even overnight. While there is no treatment as such, we could prescribe some medicines that could reduce or even push the condition into remission.
• Telogen effluvium could happen due to high fever, surgery which required anaesthesia or even severe stress caused due to death or other such serious incidents. If you are seeing partial baldness or severe hair loss, this could be the reason why. Again, there is no cure or prescribed treatment, we have seen that in most cases, the hair grows back on its own in a matter of six to twelve months.

Your daughter is too young for a transplant, because hair loss too needs to stabilise, before a transplant can be considered. Normally, we suggest transplant processes for people who have crossed their thirties.