The average period that it takes for grommets to fall out is about 6 months but it is very possible for this period to be shorter or significantly longer. The best would be to take her for a middle ear test to an audiologist, just to make sure if the grommets are still open. If it is open, pressure won't be able to build up in the ear, to a point of discomfort for your daughter. You could also make sure that during the flight (take-off and landing) she chews something like jelly babies that can control the pressure in the middle ear.
If you don't know of an audiologist in your area, please let me know and i will gladly refer you (firstname.lastname@example.org)
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