HI, thanks for using healthcare magic
It is possible that she has eusthacian tube dysfunction. The eusthacian tube is a narrow tube that connects the back of the middle ear with the nose.
It has different functions: (1)ventilation of the middle ear
(2)protection of the middle ear from secretions and sound pressures
(3)clearance of middle ear secretions into the middle pharynx
With your daughter's history of sinusitis
, it is possible that this has become blocked.
This would require treatment of the sinuses
with topical steroid
nasal sprays, antihistamines and decongestants.
These medications can usually be obtained over the counter.
I hope this helps