All unvavoidable had the family spent some time giving this young woman a language. Even without schooling she would have done much, much better.
It's going to be a long hard ordeal trying to figure out what she knows and what she doesn't. when EVERYTHING you know about the world comes from just watching, you make some funny connections. I had a student once, who DID have language, but not at home (his family never learned to sign, and he didn't read lips). ANYWAY, we were working in class and he pointed out (high shool) that a teacher had just bought a black car. He said that was stupid. I asked why. He said it's because black cars have more engine problems than other cars. His family had had a black car and it always broke down. Their other didnt. They bought a second black car. It broke down a lot. He said the blackness caused it. I asked, what would happen if I painted my light blue car black. His answer was that it would break down.

PS, I don't want to leave anyone with the impression that being deaf is in any way a mental disability. A deaf child who has adequate access to language and communication can do anything we do, can go to college if they'd like, can do and be anything.
A deaf child without adequate access to language in the first five years, who gets their first access to language in school is usually going to struggle with language, but will otherwise be okay. (This is the most common scenario. a kid arrives at school at 3-5 with not much and the school spends a lot of time playing catch up).

A deaf child who goes their whole LIFE (this woman is 24) without language is not going to understand much of how the world works.

It's a child abuse I see much too often.