Epsom Salt compress!
Epsom Salt is so cheap, effective, versatile, and easy, I don't know why we don't hear more about it's use! It's a good soak for sore, aching muscles (or the whole body, for that matter), infected areas (or areas that are susceptible to GETTING ifected such as a surgery site or irritated place), etc. Add 1 Tablespoon to 1 cup hot water, and wet a washcloth with it and hold it on her ear 4-5 minutes 4-5 times a day. You can even re-heat and re-use the same water and cloth. Just be careful not to burn yourself or her.
I'll bet it'll clear it right up!
I read your other posts, & I hope it's not MRSA; and different people are allergic to different metals. Some people can ONLY wear cheap earrings, and others need platinum, gold, sterling silver, titanium, or surgical steel.