What a cute story and a great reminder that taking a small chance can pay off massively! But also, for anyone reading this, getting hearing aids isn't the be-all and end-all for many people who are deaf/Deaf. It may be physically or financially impossible, and even if it isn't, the person may prefer being deaf. That's perfectly valid and should be represented more.
She wouldn't understand anything anyone says, she's never heard English before. She needs to learn language from the ground up. American sign language is not English, the languages are not mirror images of each other. Deaf people have their own language. This story is not true.
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I have expected something like this as well though...