Thanks for posting query
As you have mentioned it seems that she is suffering from chronic pharyngitis
. When there is inadequate treatment of acute condition it becomes chronic one. Most common cuase for this condition is bacterial infection. So she needs proper ENT checkup along with some blood tests for bacterial infection like CBC and ASO titre, if required culture of throat wall etc. If it is chronic pharyngitis then she will need prolonged antibiotic course.
So I would suggest you to consult an ENT specialist
for proper clinical evaluation, diagnosis and for management. Don't ignore because all these throat infections may complicate into some kidney
and heart problems.
I hope this answers your query effectively.
In case you have additional questions or doubts, you can forward them to me, and I shall be glad to help you out.
Please accept my answer in case you do not have further queries.
Wishing you good health.