Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that your daughter is suffering from inflammation of the tongue, also known as 
Glossitis and can be due to hormonal changes that occurs during 
Menstruation..
It can also be due to deficiency of Iron and 
Vitamin B12, traumatic injury to tongue, burning with hot liquids etc..
Nothing to worry as it will hopefully resolve soon..
You can give her a 
multivitamin tablet daily for 15 days..
She can do warm saline gargles..
Gargle with Numbing mouthwash containing Lignocaine if there is pain..
You can rinse with cool water and suck ice..
Avoid spicy and hard foods..
Maintain a good 
oral hygiene..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.