Thanks for that information. An allergic reaction to her "shots" should have only lasted a short while. So if it was an allergic reaction, I would think it was to some other substance such as a food item or environmental allergen. In that case it is not going to get much better until you find the allergen and eliminate her exposure to it. I'll give you some more information on that in a minute.
The new drops are fine for use where a bacterial infection is present. However, if it is a yeast dermatitis, it won't have much affect. Miconazole cream from the drug store can help for a yeast dermatitis. It also helps with itchiness as well.
At this point, I would seek a second opinion of another vet in a different practice since your vet is not achieving any results. If this has been going on for this long, the infection may be in the middle or inner ear. When inflammation occurs in the inner ear it can cause issues such as nausea, stumbling and incoordination as the vestibular system is affected. Read more on this here:
Since I really think that there is an underlying cause for the chronic ear infection, you may want to consider a food trial which basically is putting your dog on a limited ingredient diet such as venison and sweet potato diet and give no other treats or food during the trial. Do this along with treating the ear infection. It can take up to six week or longer to see improvement once the allergen is eliminated so do not give up after a few weeks. Read more on allergies on the following sites.
So you might consider allergy testing. Read about that here:
If the allergen can not be avoided, then desensitization shots can be developed to help eliminate symptoms.
You might also try benadryl at a dosage of 1-2mg per pound every 8 hours. That can help with the allergic reaction. The otic solution should help with inflammation as well. With the inflammation reduced, it should help with pain as well. There really isn't a pain reliever I could recommend at this point. However, if she was my dog I'd probably elect to see a specialist at this point due to the time she has been dealing with this issue with no real improvement.
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.