welcome in H.C.M.
I have gone through your query regarding sinus infection
and bilateral hearing loss
I would like to tell you that sinus infection of your daughter had given rise to throat infection
and via Eustachian tube it has reached to both ears and thus your daughter had developed blockade in ear due to secretion of fluid in middle ears (glue) which is responsible for hearing loss.
As from right ear this glue like fluid came out your daughter feels better hearing in right ear while left is still deaf.
Thus your daughter is suffering from sinusitis
with secretory otitis