Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern.
As per your complain and presentation of symptoms the
red blisters at the back of tongue seems to be swollen Circumvallate Papillae that are present n the back one third of tongue in a typical "V" Shaped pattern.
Infection in throat,
cough and
cold or eating something very ho or burning with hot fluids are the common causes that causes its inflammation..
Nothing to worry as it will resolve soon.
Give her a short course of antibiotics like
Amoxicillin.
Anti-inflammatory painkiller like
Ibuprofen can be given to relieve pain and swelling.
Warm saline gargles will relieve..
Avoid hot and spicy foods and take a soft and cool diet..
Hopefully she will get better in 3 to 4 days..
If still no relief consult an Oral physician and get evaluated..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.