Almost all babies outgrow the habit. Until yours does, you can give her plenty to do and look at and offer her a chilled teething ring. If she's still grinding after all her teeth come in, have a pediatric dentist check them for signs of excessive wear or seizures

Teeth grinding is called bruxism. "It could be seizures which requires anticonvulsants; it could be a habit which can be handled by the dentists".
kindly take the child to the hospital for proper monitoring and evaluation and management.