How would you treat your cat's aural hematoma?

Our youngest cat shakes her ears a lot. She does not have ear mites. She did develop an aural hematoma, a collection of blood in the membrane of her right ear that looked like a huge blister. The cat did not seem to be in pain. However, I was afraid that it would rupture and she would spill blood and fluid in our house.

Our vet performed surgery, which evidently was successful but I believe that our cat was traumatized by the experience. Since then, I have read that there are other ways of dealing with an aural hematoma, including doing nothing! Given the fact that our cat still likes to shake her ears, I would not be surprised if she gave herself another hematoma. If you know about this kind of problem, what would you recommend?