Middle ear infections (Otitis media) are almost always a result of the Eustachian Tube not draining. In children, the ET is short and horizontal...as you mature it elongates and becomes more vertical. This "defect" is more pronounced in some children than others. When a child has a bout with a cold or allergies, the normal secretions thicken and sit rather than drain. This moist, warm environment is what causes the infection.
My daughter just had her second set of tubes "installed" right before her third birthday (the first set was just before her first birthday). I exclusively breastfed for 9 months and continued to nurse until 18 months...boy did I feel screwed (lol) when the ear infections flared up at 6 months! I didn't have many ear infections, but my Mom (still does), both my brothers had at least one set of tubes, and her half-siblings had them.
I was resistant to the ear tube surgery the first time around and tried all alternative methods--chiropractic, oregano oil (she did smell like yummy Italian food), garlic oil, benadryl. Nothing really worked. She had ear infection after ear infection for nearly 6 months--we would finish a course of antibiotics only to have another to flare up within 2-3 weeks. I was lucky to work for such a great company, because one month I only managed to work two week--she was either puking from the ear infection or had explosive diarrhea from the antibiotics (she ate GOOD yogurt and got acidophilus every day).
In hindsight, I realize that the other "oils" COULDN'T work. In a healthy ear, the ear drum seals the inner ear from outside contamination. I realized this after the first tube surgery...after the tubes are in place, you can treat ear infections with ear drops instead of oral antibiotics because they can get into the ear. Yes, they can still get ear infections after the tubes. The upside is that it is less painful, many clear up on their own, and it can be easy (if a little gross) to see the drainage coming out of their ears.
After she got her first set, I had a lot of success avoiding antibiotics using Mucinex when she would get a cold to thin the mucus.
When she turned a year and I introduced milk, I rotated through cow, goat, and soy milk. As much to introduce her to new flavors as to avoid too much of one thing.
The "usual" rule of thumb is that 3 infections in 6 months is a referral to an Ear Nose and Throat Specialist. The ENT may evaluate for a another couple of months, try some new therapies, or recommend surgery based on the history.
The second time around, I knew the surgery was the way to keep my daughter healthy and happy. It isn't ever something that we want to do...but a sick kid doesn't thrive. My daughter stopped cruising around, stopped verbal development, and had trouble sleeping during those six months.
You should ask your doctor if a dosage of Mucinex would be appropriate. Start using it as soon as you see the sniffle develop, reduce the dairy in her diet, and get plenty of clear fluids in her. It may help keep the mucus thin enough to keep it moving.
I have used some homeopathic expectorants with some success...but the Mucinex is, by far, the more effective option.