Ussually there is nothing orally available for ear infections? Do you know what type of infection?

Do you know how the vets & techs hold dogs? That is the best technique ever, very very hard to explain without actually seeing it. Maybe bring her in to the vets & have them show you?

You also have to be very very stern. Yell at her if needed & always praise when she's good. The bad part is once she knows she can get away she will try even harder everytime after. Maybe back her in a corner and you & hubby hold her down??

other than thay you have tried all other options (except maybe really yummy treats, meat or that cheese thats in a spray type container)

But one thing you should do is not give up, even after the meds are gone keep the bottle & just pretend to put drops in her ears, just hold the bottle next to her etc... everytime she ignores the bottle praise her!!!!!
Cleaning the ears often (especially w/ fl;oppy eared dogs) will help w/ infections but you have to use drops then too.
good luck