Talk to Ent Specialist on Ear Drum Issue. She Can't Listen Now

Dr sab my sister at age of 11 months Dr inject her with a fever medicine which was required one fourth instead of full dose. She was unconscious for two days and later another doctor in his consultation told us to wake her up with water. We put her under the tap. At same time he shared that it might damage her ear drum and later it was the same. The ask is about her treatment. Is ear drum operation is possible, that she start listening again or not.