
My last dog (lab cross) would get ear infections often, they'd get very bad to the point that blood would be weeping from his ear with the puss :( The last one he had
(the one that convinced me there had to be a trigger, not just bad luck)
was awful. He was fine when I went to bed, when I got up in the mornin, his face & neck were swollen & hanging like a large, semi-infalted footabl on the side of the bad ear, he couldn't hold his head up straight and was reluctant to move it as movement hurt his ear & made him scream :(
The verts weren't much help, only testing the infection to get the specific ABs right and prescribing a wash to flush his ears out weekly (if used weekly, the wash appeared to make his ear worse).
The infections were getting worse & more often, they only ever happened in the one ear. He hated goign to the vet and didn't like strangers anywhere near his ears, so getting treatment for his bad ear was always a terrible ordeal for him :(
I kept a bit of a food diary and tried different foods (not too strict, I wasn't aware of a proper elimination diet then). After a short time, I was convinced that chicken was the problem. I removed that from his diet (he was on wet & dry food, so just read ingredients and ensure chicken wasn't listed anywhere). This seemed to do the trick.
If he ever got hold of even a morsel of chicken he'd start shaking his head & scratting his ear, it would get worse if he ate any more chicken. BUt, knowing to keep him away from chicken meant he never had an ear infection again, only ever irritaion from snaffling a dropped morsel.
In his final 6 months, he started to get a slight occasional irritation in that ear again, but as long as he never had ham he was fine.
I hope you can get to the bottom of it, my dog would look so sorry for himself when his ear was bad. It would be great if you could find the trigegr and prevent her having to get poorly a poorly ear.