I was impressed with how well she could speak in this video and she has an explanation:
In response to how well she speaks having never heard her own voice, she said she'd gotten by in life by reading lips. “My whole life I've been complimented on how well I speak,” she wrote. “I don't really have an answer for you other than I have always had a passion for reading, grammar, and English. My hearing loss was/is considered severe to profound. I've worked very hard to be able to interact and blend in…only thing I can say is ‘God is good.'”Great story and I wish her the best.
By the way, for all those dummies at #OccupyWallStreet , it was a corporation that created the technology that made this happen, not some drugged out hippie drum circle.