I am not familiar with that medication but I did look it up and it seems to have all the ingredients most ear medications have. What did the vet say was exactly in the ear canal? If a swab was not done and the causative agent identified then I would have that done. Additionally, a culture sent off would be a good idea, albeit more expense for you.
Usually otitis can be allergy mediated as I've stated before. It is good that she is no longer itching and biting her feet, but she is still exhibiting otitis which may certainly be linked to allergies and/or her diet. I would definitely do a food trial with Z/D ultra from hill's or the royal canin or IVD restricted protein diet (kangaroo, venison, duck, etc.) Be aware that if you do this trial, that you can feed the dog NOTHING ELSE as the diet is designed to restrict proteins to see if the dog is sensitive to them.
I have not examined your dog's ears as your vet has but can tell you that usually you can see the ear drum unless there is extreme swelling which sometimes is present. Head tilt from itchy ears is not what I was referring to with an inner ear infection. Usually you have loss of balance, falling to the affected side, and oscillation of the eyes from the balance problems. What you describe does not sound like inner ear to me.
I cannot speak on sedation and flushing but we routinelly do it where I practice. We have an auriflush which I like; not sure if your vet is set up to do this.
Surgery is an option with chronic non-responsive otitis. The dog is deaf but free of the pain and inflammation that comes with ear infections.
Did the vet give a steroid shot or antibiotic shot?
To recap, I'd do an ear swab if not already done and +/- a culture of ear contents, and definitely do a 4-6 week food trial with the diets listed (organic is NOT hypoallergenic).
**I did not examine your dog and am not second guessing his/her treatment plan, just letting you know how I would treat what you describe**
Let me know if you have any more questions.