Thanks for asking the query,
Sometimes if the nerve is in close proximity of the extracted tooth gets damaged, goes in transient paralysis
, it can be due to damage to the nerve at the time of giving local anesthesia
Dont worry it will get healed in some time.
Healing of nerve is a slow process and usually takes 3-6 months.
You give your child multivitamin
Maintain a good oral hygiene
Give her lukewarm saline nad antiseptic mouthwash rinses.
Wish her a healthy recovery,